Resource Graph validations

[bart-degreed]

The following fails at startup with InvalidConfigurationException:

• NEW: Two resources with the same public name in the resource graph
• NEW: Resource contains attributes/relationships with the same public name
• NEW: Resource implements IIdentifiable, but not IIdentifiable<TId>
• NEW: Relationship in resource points to a resource type that is not in the resource graph
• NEW: Found JSON:API controller that uses a resource type that is not in the resource graph
• Found multiple JSON:API controllers that use the same resource type
• services.AddResourceService/AddResourceRepository/AddResourceDefinition is called with a type that does not implement any of the JsonApiDotNetCore interfaces

The following logs a warning at startup:

• Resource that does not implement IIdentifiable is skipped during discovery or while adding from DbContext.
• NEW: Resource contains no attributes
• NEW: Empty resource graph

Fixes #170.

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• N/A: Documentation updated
• N/A: Created issue to update Templates: {ISSUE_NUMBER}

[codecov]

Codecov Report

Merging #1101 (22a0a09) into master (b88d39e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1101      +/-   ##
==========================================
+ Coverage   88.59%   88.60%   +0.01%     
==========================================
  Files         255      255              
  Lines        7127     7160      +33     
==========================================
+ Hits         6314     6344      +30     
- Misses        813      816       +3     

Impacted Files	Coverage Δ
...piDotNetCore/Configuration/ResourceGraphBuilder.cs	98.44% <100.00%> (+0.49%)	⬆️
...iDotNetCore/Middleware/JsonApiRoutingConvention.cs	90.47% <100.00%> (+0.31%)	⬆️
...c/JsonApiDotNetCore/Configuration/ResourceGraph.cs	75.00% <0.00%> (-5.00%)	⬇️

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