feat(graphql_flutter): Decouple GraphQLClient Provider

[budde377]

This PR provides widgets and hooks variants which does not depend on the GraphQL Client Provider (see #640)

[codecov]

Codecov Report

Merging #1108 (5effdf6) into main (90e5d45) will decrease coverage by 0.43%.
The diff coverage is 53.84%.

❗ Current head 5effdf6 differs from pull request most recent head 750ca05. Consider uploading reports for the commit 750ca05 to get more accurate results

@@            Coverage Diff             @@
##             main    #1108      +/-   ##
==========================================
- Coverage   60.01%   59.57%   -0.44%     
==========================================
  Files          41       41              
  Lines        1528     1561      +33     
==========================================
+ Hits          917      930      +13     
- Misses        611      631      +20     

Impacted Files	Coverage Δ
...raphql_flutter/lib/src/widgets/hooks/mutation.dart	0.00% <0.00%> (ø)
...ages/graphql_flutter/lib/src/widgets/mutation.dart	0.00% <0.00%> (ø)
...hql_flutter/lib/src/widgets/hooks/watch_query.dart	68.29% <25.00%> (-10.09%)	⬇️
...s/graphql_flutter/lib/src/widgets/hooks/query.dart	81.25% <50.00%> (-18.75%)	⬇️
...ql_flutter/lib/src/widgets/hooks/subscription.dart	54.16% <50.00%> (-4.53%)	⬇️
...ackages/graphql_flutter/lib/src/widgets/query.dart	100.00% <100.00%> (ø)
.../graphql_flutter/lib/src/widgets/subscription.dart	100.00% <100.00%> (ø)

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