Extensible cache driver framework

[AndrewJo]

This PR adds ability for users to extend adonis-throttle by providing custom cache drivers. Redis driver is included as a reference implementation. This PR should not break any backwards-compatibility and the minor version can be bumped as per SEMVER 2.0 specification.

Changes

• [x] Introduce Adonis/Addons/Throttle/Cache abstract base class to ensure public API methods used by Adonis/Addons/Throttle class are implemented by the user
• [x] Refactor ./src/Drivers/Cache/Memory class to extend Cache abstract base class
• [x] Include ./src/Drivers/Cache/Redis class as reference implementation
  • Recommended for use in clustered, containerized or serverless environments where state must be shared across multiple instances of AdonisJs framework running on different machines
  • adonis-throttle does not include @adonisjs/redis as dependency to keep dependency tree small. The end-user is responsible for installing @adonisjs/redis as dependency in their project should they wish to use the Redis driver
• [x] Add instructions CLI hook (instructions.js, instructions.md)
  • When installed via adonis install CLI command, automatically adds config/throttle.js to user's project and displays usage instructions
• [x] Update README with new installation instructions, and adds new section for extending cache drivers

[masasron]

Thank you @AndrewJo, great work! 👍

[AndrewJo]

Thank you @AndrewJo, great work! 👍

You're welcome @masasron! I decided to write it after I realized that this provider doesn't consistently rate limit requests if I horizontally scale AdonisJs in Docker containers.

Please let me know when you plan on releasing v2.2.0 on npm.

Also, what are your plans for CI/CD for this package? I can help set up an automated release pipeline so that a new version tag would trigger a new npm release if you're interested.

[masasron]

@AndrewJo that would be great, let's talk

[AndrewJo]

@masasron sounds good. I'll create a new issue. Let's move our conversation there.