Add more replacement suspend functions for source APIs

These are basically 1-to-1 replacements for the existing RxJava APIs.
This will make the initial migration off of RxJava simpler. We'll
revisit the actual call flows in followup versions of the API.

(cherry picked from commit 26c5d761da4ba577481f41e63f03952b8a6c323f)

# Conflicts:
#	data/src/main/java/tachiyomi/data/source/SourcePagingSource.kt
#	source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/online/HttpSource.kt
#	source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/online/HttpSourceFetcher.kt

core/src/main/java/eu/kanade/tachiyomi/network/OkHttpExtensions.kt

@@ -58,6 +58,15 @@ fun Call.asObservable(): Observable<Response> {
     }
 }
 
+fun Call.asObservableSuccess(): Observable<Response> {
+    return asObservable().doOnNext { response ->
+        if (!response.isSuccessful) {
+            response.close()
+            throw HttpException(response.code)
+        }
+    }
+}
+
 // Based on https://github.com/gildor/kotlin-coroutines-okhttp
 @OptIn(ExperimentalCoroutinesApi::class)
 private suspend fun Call.await(callStack: Array<StackTraceElement>): Response {
@@ -95,6 +104,9 @@ suspend fun Call.await(): Response {
     return await(callStack)
 }
 
+/**
+ * @since extensions-lib 1.5
+ */
 suspend fun Call.awaitSuccess(): Response {
     val callStack = Exception().stackTrace.run { copyOfRange(1, size) }
     val response = await(callStack)
@@ -105,15 +117,6 @@ suspend fun Call.awaitSuccess(): Response {
     return response
 }
 
-fun Call.asObservableSuccess(): Observable<Response> {
-    return asObservable().doOnNext { response ->
-        if (!response.isSuccessful) {
-            response.close()
-            throw HttpException(response.code)
-        }
-    }
-}
-
 fun OkHttpClient.newCachelessCallWithProgress(request: Request, listener: ProgressListener): Call {
     val progressClient = newBuilder()
         .cache(null)