Merge branch 'lineage-17.1' of https://github.com/LineageOS/android_packages_apps_Messaging into int/10/fp2

The LineageOS branch contains many fixes, incl. basics such as
displaying notifications and UI improvements that make life better.

Issue: FP2A10-165
Change-Id: I2bceef39e8f359323c62614eeaafb070509c30c7