Add connection parameters to the websocket scope

[abompard]

The Apollo client supports a websocket authentication method by passing "connection parameters" to the client, that end up in the connection_init message.

This changeset makes those parameters available in the WebSocket request's scope.

[codecov[bot]]

Codecov Report

Merging #2 (ae328c5) into master (fdf34d0) will increase coverage by 0.05%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #2      +/-   ##
==========================================
+ Coverage   89.23%   89.28%   +0.05%     
==========================================
  Files           1        1              
  Lines         195      196       +1     
==========================================
+ Hits          174      175       +1     
  Misses         21       21              

Flag	Coverage Δ
unittests	89.28% <100.00%> (+0.05%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
starlette_graphene3.py	89.28% <100.00%> (+0.05%)	:arrow_up:

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[ciscorn]

@abompard Great. Thanks!