treblle-ruby version 2

[KapustaB]

Summary:

This PR is refactoring of the original treblle-ruby SDK and introduces numerous improvements.

Improvements introduced:

• replaced direct usage of ENVs for configuring SDK in Rails applications with configuration
• improved structure and flexibility of the code overall
• improved payload data sent to Treblle
• added support for configuring additional sensitive attributes
• added support for configuring restricted/blacklisted API paths that Treblle shouldn't monitor
• added gemfile for dependencies
• added rubocop rules (lint)
• added rakefile for running specs and rubocop
• added support for ruby >= 3.0
• added support for rails >= 6.1 with gemfile.lock for each release
• added tests
• added github action to run tests on supported versions of ruby and rails
• added MIT licence
• added SECURITY notes

Description:

Not properly working SDK and introducing improvements was the main motivation for introducing this PR.

Testing:

To run all specs locally:

bundle exec rake rspec

To run specs on all supported versions of Rails:

bundle exec appraisal rspec