Rails 7 postgres compatibility

[spearce-citybase]

Hi friend. We recently made this change in our forked repo to support Rails 7.0+. Thought I'd drop it here in case you wanted to pull in any changes.

Description

The 7.0+ postgres activerecord adapter added a create_enum method that conflicts with the create_enum method of power_enum. This PR resolves this naming conflict by renaming the method to create_power_enum.

Changes

• Rename create_enum to create_power_enum
• Rename remove_enum to remove_power_enum
• timestamped_migrations was moved from ActiveRecord::Base to ActiveRecord in Rails 7.0.
• Remove compatibility with rails <7.0
• Update version to 5.0.0

[albertosaurus]

Thanks, I'll take a look.