Migrate Gradle dependencies to version catalogs (#8443)

### Description

Migrate Gradle dependencies to version catalogs. This is the modern
style of managing dependencies. Confirmed with diff on `./gradlew
:app:dependencies` that no versions changed.

### Checklist
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- [x] I have performed a self-review of my code, going through my
changes line by line and carefully considering why this line change is
necessary
- [x] I have run the automated code checks using `./gradlew checkstyle
lint`
- [x] My code follows the style guidelines of the AntennaPod project:
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- [x] I have mentioned the corresponding issue and the relevant keyword
(e.g., "Closes: #xy") in the description (see
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- [x] If it is a core feature, I have added automated tests

storage/database-maintenance-service/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id("com.android.library")
+    alias(libs.plugins.android.library)
 }
 apply from: "../../common.gradle"
 apply from: "../../playFlavor.gradle"
@@ -12,8 +12,8 @@ dependencies {
     implementation project(':storage:database')
     implementation project(':ui:notifications')
 
-    annotationProcessor "androidx.annotation:annotation:$annotationVersion"
-    implementation "androidx.core:core:$coreVersion"
-    implementation "androidx.work:work-runtime:$workManagerVersion"
-    implementation "com.google.guava:guava:31.0.1-android"
+    annotationProcessor libs.androidx.annotation
+    implementation libs.androidx.core
+    implementation libs.androidx.work.runtime
+    implementation libs.guava
 }

storage/database/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id("com.android.library")
+    alias(libs.plugins.android.library)
 }
 apply from: "../../common.gradle"
 apply from: "../../playFlavor.gradle"
@@ -21,17 +21,17 @@ dependencies {
     implementation project(':system')
     implementation project(':ui:app-start-intent')
 
-    annotationProcessor "androidx.annotation:annotation:$annotationVersion"
-    implementation "androidx.core:core:$coreVersion"
-    implementation 'androidx.documentfile:documentfile:1.0.1'
+    annotationProcessor libs.androidx.annotation
+    implementation libs.androidx.core
+    implementation libs.androidx.documentfile
 
-    implementation "commons-io:commons-io:$commonsioVersion"
-    implementation "org.greenrobot:eventbus:$eventbusVersion"
-    implementation "com.google.guava:guava:31.0.1-android"
-    implementation "org.apache.commons:commons-lang3:$commonslangVersion"
+    implementation libs.commons.io
+    implementation libs.eventbus
+    implementation libs.guava
+    implementation libs.commons.lang3
 
     testImplementation project(':parser:feed')
-    testImplementation "junit:junit:$junitVersion"
-    testImplementation "androidx.test:core:$testCoreVersion"
-    testImplementation "org.robolectric:robolectric:$robolectricVersion"
+    testImplementation libs.junit
+    testImplementation libs.androidx.test.core
+    testImplementation libs.robolectric
 }

storage/importexport/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id("com.android.library")
+    alias(libs.plugins.android.library)
 }
 apply from: "../../common.gradle"
 apply from: "../../playFlavor.gradle"
@@ -17,18 +17,18 @@ dependencies {
     implementation project(':model')
     implementation project(':net:download:service-interface')
 
-    annotationProcessor "androidx.annotation:annotation:$annotationVersion"
-    implementation "androidx.core:core:$coreVersion"
-    implementation 'androidx.documentfile:documentfile:1.0.1'
-    implementation "androidx.work:work-runtime:$workManagerVersion"
+    annotationProcessor libs.androidx.annotation
+    implementation libs.androidx.core
+    implementation libs.androidx.documentfile
+    implementation libs.androidx.work.runtime
 
-    implementation "commons-io:commons-io:$commonsioVersion"
-    implementation "io.reactivex.rxjava3:rxandroid:$rxAndroidVersion"
-    implementation "io.reactivex.rxjava3:rxjava:$rxJavaVersion"
-    implementation "org.greenrobot:eventbus:$eventbusVersion"
-    implementation "com.google.guava:guava:31.0.1-android"
+    implementation libs.commons.io
+    implementation libs.rxandroid
+    implementation libs.rxjava
+    implementation libs.eventbus
+    implementation libs.guava
 
-    testImplementation "junit:junit:$junitVersion"
-    testImplementation "androidx.test:core:$testCoreVersion"
-    testImplementation "org.robolectric:robolectric:$robolectricVersion"
+    testImplementation libs.junit
+    testImplementation libs.androidx.test.core
+    testImplementation libs.robolectric
 }

storage/preferences/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id("com.android.library")
+    alias(libs.plugins.android.library)
 }
 apply from: "../../common.gradle"
 
@@ -14,7 +14,7 @@ android {
 dependencies {
     implementation project(':model')
 
-    annotationProcessor "androidx.annotation:annotation:$annotationVersion"
-    implementation "androidx.fragment:fragment:$fragmentVersion"
-    implementation "androidx.preference:preference:$preferenceVersion"
+    annotationProcessor libs.androidx.annotation
+    implementation libs.androidx.fragment
+    implementation libs.androidx.preference
 }