feat: Add facades for all managers

[ollieread]

This PR is all about facades. While I don't particularly like them, and avoid using them at all costs, I recognise that others will like them.

This PR does the following:

• Updates the Sprout facade to reflect the previous refactors
• Adds an Overrides facade for the ServiceOverrideManager class
• Adds a Providers facade for the TenantProviderManager class
• Adds a Tenancies facade for the TenancyManager class

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.30%. Comparing base (7f831b9) to head (dd223c4).
Report is 1 commits behind head on 1.x.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##                1.x      #94      +/-   ##
============================================
+ Coverage     88.24%   88.30%   +0.06%     
- Complexity      557      561       +4     
============================================
  Files            65       69       +4     
  Lines          1557     1565       +8     
============================================
+ Hits           1374     1382       +8     
  Misses          183      183              

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