Enable Rails 7 error reporter via Rollbar config

[waltjones]

Description of the change

Optionally enables the Rails 7 error reporter. https://edgeguides.rubyonrails.org/error_reporting.html

The new Boolean config key is enable_rails_error_subscriber.

      Rollbar.configure do |config|
        config.enable_rails_error_subscriber = true
      end

This is off by default for back compatibility, and can be enabled in the Rollbar initializer, or enabled/disabled at any time via the Rollbar.configure method.

This is available with Rails 7.1+ because that's when unsubscribe was introduced.

This PR also fixes an issue with the Rollbar::Logger class.

• initialize should call super. This issue breaks in recent Logger versions.
• The Logger version should be used to branch in tests.

Normally I'd put this in a separate PR, but since it breaks CI I've added it here.

Note: This PR also enables both hash syntaxes in rubocop.

Type of change

• New feature (non-breaking change that adds functionality)

Related issues

Fixes:
#1105
#1153
#1156

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• Issue from task tracker has a link to this pull request
• Changes have been reviewed by at least one other engineer

[matux]

Just two small comments

[matux]

Looks awesome!

[dcrec1]

When used with Sidekiq, this reports a lot of Sidekiq::JobRetry::Handled errors that can't be filtered. Is this expected?