Merge pull request #13107 from chancancode/has_one_counter_cache_should_raise

Raise `ArgumentError` when `has_one` is used with `counter_cache`
Typo fixes [ci skip]
Merge pull request #13111 from akshay-vishnoi/typo

Typo fixes [ci skip]
Improve AR changelog [ci skip]
Added back the `encode_big_decimal_as_string` option with warning

Also added the missing CHANGELOG entry for #12183 @ 80e7552073 and
4d02296cfb.