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
f4e92e4a56