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Set precision 6 by detauls for datime columns when using sqlite3_adapter

 Set precision 6 by detauls for datime columns when using postgresql_adapter

Update activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

Co-authored-by: Zachary Scott <zzakscott@gmail.com>

Update tests precision

Add datetime precision by using the migration compatibility layer

Add default precision when adding new column for a table

Fix compatibility tests

Add changelog entry

Update postgres test cases

Custom type does not support precision

Typo ⌨️

Fix specific mysql2 schema

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