v1.2.0: Official Support for rails 7.1 and ruby 3.x ++ Setup GitHub actions (#4)

* Setup github actions; Add gemfiles
* Drop support for rails < 5.0
* allow later rake
* fix min version
* remove sqlite from gemfiles
* fix rubocop
* latest rubocop
* update todo
* fix long line
* explicit branch for active_attr
* update rubocop todo
* double star splat for ruby 3.0
* also run rails 7.1 with ruby 2.7/3.0
* fix ambiguity
* fix error RegExp for ruby 3.3
* bump version
* coveralls token