TryGetKeyedServiceKey<T>; allow [ServiceKey] injection during AnyKey resolution

[tillig]

• Adds a new TryGetKeyedServiceKey<T> method to allow retrieving the parameter without having to handle exceptions.
• Fixes an issue where resolving a keyed collection using AnyKey would not pass the key parameter down the stack and, thus, wouldn't obey [ServiceKey] marked constructor parameters.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.55%. Comparing base (acb2557) to head (f0b3b96).
⚠️ Report is 6 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1476      +/-   ##
===========================================
- Coverage    78.57%   78.55%   -0.03%     
===========================================
  Files          216      216              
  Lines         5611     5604       -7     
  Branches      1207     1209       +2     
===========================================
- Hits          4409     4402       -7     
  Misses         695      695              
  Partials       507      507              

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