improve grapphql ws protocol docs

[vincenzopalazzo]

There is a collision name between javascript ecosystem and graphql protocols, and this makes the usage of the enum very difficult.

In addition, this is the first of a sequence of PR that improve graphql protocols handling

This should fix #1162

In addition, this introduces the new field in the commit header proposed in #1179 (comment) but this is still working in progress

[codecov]

Codecov Report

Merging #1180 (42595e9) into main (0d8a3d0) will decrease coverage by 0.03%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main    #1180      +/-   ##
==========================================
- Coverage   59.72%   59.68%   -0.04%     
==========================================
  Files          41       41              
  Lines        1676     1677       +1     
==========================================
  Hits         1001     1001              
- Misses        675      676       +1     

Impacted Files	Coverage Δ
...l/lib/src/links/websocket_link/websocket_link.dart	0.00% <ø> (ø)
...lib/src/links/websocket_link/websocket_client.dart	81.77% <87.50%> (-0.41%)	⬇️

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[vincenzopalazzo]

Merging this for the moment, but I would like to keep this issue alive #1162

because there is somethings strange that happens when e we are working ws!