[Feature] Customizable route path, supports for SQLite and some improvements

[sethsandaru]

Closes #2

Configuration

We can now customize the route path via config('inbox.route_path'), by default it is inbox

Added SQLite support

SQLite is fast, minimal, and could be really useful for applications that only need to record msgs, resolve them, and flush the inbox msgs frequently.

Improvements

Authorize & Validate

Now you can implement authorize and rules for your Request class. The built-in inbox HTTP layer will make sure both will be run to ensure the requests are legit to go into DB.

Best practices: use authorize to check the signature of the payload (signing, validating, etc) and use rules to ensure the payload is good enough.

Covered in tests.

Removed composer.lock

Like every other PHP packages, we only need composer.json which includes every dependency and information.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.44%. Comparing base (e0a73c3) to head (8072609).

Additional details and impacted files

@@             Coverage Diff              @@
##               main       #3      +/-   ##
============================================
+ Coverage     96.37%   96.44%   +0.07%     
- Complexity       56       57       +1     
============================================
  Files            13       13              
  Lines           248      253       +5     
============================================
+ Hits            239      244       +5     
  Misses            9        9              

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