Schema description

[lirsacc]

Add support for schema descriptions.

[codecov-io]

Codecov Report

Merging #7 into dev will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@ Coverage Diff @@ ## dev #7 +/- ## ======================================= Coverage 95.12% 95.12% ======================================= Files 65 65 Lines 6458 6461 +3 Branches 1137 1137 ======================================= + Hits 6143 6146 +3  Misses 185 185 Partials 130 130 

Impacted Files	Coverage Δ
src/py_gql/schema/introspection.py	91.66% <ø> (ø)
src/py_gql/sdl/schema_from_ast.py	91.45% <ø> (ø)
src/py_gql/utilities/introspection_query.py	100.00% <ø> (ø)
src/py_gql/lang/ast.py	100.00% <100.00%> (ø)
src/py_gql/lang/parser.py	94.49% <100.00%> (+0.01%)	⬆️
src/py_gql/lang/printer.py	97.38% <100.00%> (ø)
src/py_gql/schema/schema.py	87.19% <100.00%> (+0.05%)	⬆️
src/py_gql/sdl/ast_schema_printer.py	96.49% <100.00%> (ø)

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