Create .gql Query provider

[gheydon]

This is a .gql version of the query provider. This will allow you to add your query as a straight text file with the extension of .gql which make it a lot easier to maintain and allow for documenting much easier.

[codecov]

Codecov Report

Merging #949 into 8.x-3.x will decrease coverage by 0.91%.
The diff coverage is 12.00%.

@@              Coverage Diff              @@
##             8.x-3.x     #949      +/-   ##
=============================================
- Coverage      79.08%   78.17%   -0.92%     
+ Complexity      1291     1153     -138     
=============================================
  Files            192      193       +1     
  Lines           3108     3051      -57     
=============================================
- Hits            2458     2385      -73     
- Misses           650      666      +16     

Impacted Files	Coverage Δ	Complexity Δ
src/Form/JsonQueryMapConfigForm.php	0.00% <0.00%> (ø)	7.00 <0.00> (ø)
...GraphQL/QueryProvider/GqlQueryMapQueryProvider.php	12.50% <12.50%> (ø)	14.00 <14.00> (?)
...hQL/Fields/Entity/Fields/Image/ImageDerivative.php	95.23% <0.00%> (-4.77%)	8.00% <0.00%> (+1.00%)	⬇️
src/Plugin/SubscriptionPluginManager.php	54.83% <0.00%> (-1.42%)	11.00% <0.00%> (-2.00%)
...c/Plugin/GraphQL/Fields/MenuLink/MenuLinkLinks.php	87.50% <0.00%> (-1.39%)	6.00% <0.00%> (-4.00%)
src/Plugin/Deriver/PluggableSchemaDeriver.php	90.11% <0.00%> (-0.99%)	44.00% <0.00%> (-40.00%)
.../Plugin/GraphQL/Interfaces/InterfacePluginBase.php	74.19% <0.00%> (-0.81%)	7.00% <0.00%> (-10.00%)
src/Plugin/GraphQL/Schemas/SchemaPluginBase.php	79.24% <0.00%> (-0.64%)	50.00% <0.00%> (-13.00%)
...re/src/Plugin/GraphQL/Fields/Entity/EntityById.php	84.00% <0.00%> (-0.62%)	10.00% <0.00%> (-8.00%)
src/Plugin/MutationPluginManager.php	80.64% <0.00%> (-0.61%)	11.00% <0.00%> (-2.00%)
... and 32 more

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