Replacing @Nullable/@NonNull with @RecentlyNullable/@RecentlyNonNull in non-android APIs

because this causes callers of those APIs to only receive warnings from kotlinc rather than errors.

Bug: 141748642

Test: m api-stubs-docs && \
      cd out/target/common && mv docs docs-new && unzip docs-new/api-stubs-docs-stubs.srcjar -d docs-new/api-stubs-docs-stubs.srcjar_unzipped && cd - && \
      cd frameworks/base && git checkout HEAD^ && cd - && m api-stubs-docs && \
      cd out/target/common && mv docs docs-old && unzip docs-old/api-stubs-docs-stubs.srcjar -d docs-old/api-stubs-docs-stubs.srcjar_unzipped && \
      diff -x "*.html" -r docs-old/ docs-new | grep -v "^diff" | sed 's/^</>/' | grep '^>' | sed 's|androidx.annotation.Recently|android.annotation.|g' | sort | uniq -c | grep "^ *1 " # And notice that there aren't any copies of "androidx.annotation.Recently" without a matching instance of "android.annotation." or vice versa

Test: m api-stubs-docs && out/target/common/docs && unzip api-stubs-docs-stubs.srcjar -d unzipped && cd unzipped && \
      grep -r "@.*NonNull" java | grep -v Recently && \
      grep -r "@.*Nullable" java | grep -v Recently

Change-Id: I156f1788880958cf3d1f030da829e76cefd6072e
Merged-In: I156f1788880958cf3d1f030da829e76cefd6072e