refactor(overrides): Refactor service overrides to allow for more complexity

[ollieread]

This PR refactors the current service override functionality with the following key changes.

• The introduction of a ServiceOverrideManager that is responsible for registering, booting and all other service override actions
• The removal of the DeferrableServiceOverride interface and functionality to support deferring service overrides
• The introduction of a request constructor for ServiceOverride implementations
• The immediate instantiation of service overrides when registered
• A new config file (config/sprout/overrides.php) to allow for more fine-grained complex config per service override
• The introduction of an override tenancy option to provide a filtered list of overrides that are enabled for the tenancy
• The introduction of an override.all tenancy option to enable all configured overrides
• The migration of the core config config/sprout.php to config/sprout/core.php

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.08%. Comparing base (734a17b) to head (72ecd65).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff              @@
##               main      #89       +/-   ##
=============================================
+ Coverage     68.49%   83.08%   +14.59%     
- Complexity      507      553       +46     
=============================================
  Files            68       73        +5     
  Lines          1441     1555      +114     
=============================================
+ Hits            987     1292      +305     
+ Misses          454      263      -191     

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