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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