[confmap] Validate providers scheme when building a Resolver

[mx-psi]

Description

Validate providers schemes when building a Resolver.

I don't consider this a breaking change since the providers would be useless if they don't follow this pattern.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.70%. Comparing base (2bb2613) to head (dddc22f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10786      +/-   ##
==========================================
- Coverage   91.71%   91.70%   -0.01%     
==========================================
  Files         406      406              
  Lines       18947    18952       +5     
==========================================
+ Hits        17377    17380       +3     
- Misses       1211     1212       +1     
- Partials      359      360       +1     

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