[cellular] Rename enums for usability, move off of main queue, touch up docs

The cell generation enums were invalid JS identifiers (can't start with a digit) so I renamed them to `CELLULAR_2G` and s

[cellular] Rename enums for usability, move off of main queue, touch up docs

The cell generation enums were invalid JS identifiers (can't start with a digit) so I renamed them to `CELLULAR_2G` and so on. Also moved the iOS module off the main queue since it doesn't touch UI. Also made some small edits to the docs and Java error code.

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[apple-authentication] Create unimodule for SignIn With Apple (#5421)

[guides] Update SDK Audit table

Added some notes on tests and docs as well since they are part of API quality.

[guides] Start tracking audited APIs