fix: Restore FEATURE_PLUGINS_ENABLED and sideload plugin dependencies

[test01203]

Hey , it looks like in one of the recent commits (598df33) the plugin system dependencies and the FEATURE_PLUGINS_ENABLED flags were accidentally removed from app/build.gradle.kts (probably during a merge conflict resolution). This caused the Plugins menu to disappear entirely from the settings. This PR restores them so the feature works again

[silentbil]

Hey, tested this branch locally — build passes and installs fine, but the app crashes on every launch with:
▎
▎ java.lang.NoSuchMethodError: No virtual method addLast(LockFreeLinkedListNode;)V
▎ in class kotlinx.coroutines.internal.LockFreeLinkedListHead (classes22.dex)
▎
▎ One of the new sideload deps (likely CloudStream3 or NiceHttp) bundles an older kotlinx-coroutines-core internally. That older class wins in the dex merge and is missing addLast() which the app expects at runtime — instant crash before anything renders.
▎
▎ Fix: force coroutines to 1.7.3 in the resolution strategy so it overrides the transitive version:
▎
▎ configurations.all {
▎ resolutionStrategy {
▎ force("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.3")
▎ force("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3")
▎ }
▎ }
▎
▎ Or exclude coroutines from the conflicting dep:
▎ add("sideloadImplementation", "com.github.recloudstream.cloudstream:library-android:v4.7.0") {
▎ exclude(group = "org.jetbrains.kotlinx", module = "kotlinx-coroutines-core")
▎ exclude(group = "org.mozilla", module = "rhino")
▎ }

[silentbil]

fixed on another PR
#362