feat: Add hooks examples

[budde377]

This PR rewrites the widgets to use hooks from flutter_hooks. These are subsequently exposed. This is a larger refactor which depends on #1037 to perform equality check of options.

While the widgets should be backwards compatible, our users will now be able to query with the syntax

final fetchResult = useQuery(QueryOptions(
  document: gql(" query { person } ")
));

[codecov[bot]]

Codecov Report

Merging #1034 (5b77b90) into beta (994e594) will increase coverage by 1.26%. The diff coverage is 38.46%.

:exclamation: Current head 5b77b90 differs from pull request most recent head b15a7d6. Consider uploading reports for the commit b15a7d6 to get more accurate results

@@            Coverage Diff             @@
##             beta    #1034      +/-   ##
==========================================
+ Coverage   52.67%   53.93%   +1.26%     
==========================================
  Files          35       40       +5     
  Lines        1513     1511       -2     
==========================================
+ Hits          797      815      +18     
+ Misses        716      696      -20     

Impacted Files	Coverage Δ
...raphql_flutter/lib/src/widgets/hooks/mutation.dart	0.00% <0.00%> (ø)
...ql_flutter/lib/src/widgets/hooks/subscription.dart	0.00% <0.00%> (ø)
...ages/graphql_flutter/lib/src/widgets/mutation.dart	0.00% <0.00%> (ø)
.../graphql_flutter/lib/src/widgets/subscription.dart	0.00% <0.00%> (ø)
...hql_flutter/lib/src/widgets/hooks/watch_query.dart	78.37% <78.37%> (ø)
..._flutter/lib/src/widgets/hooks/graphql_client.dart	100.00% <100.00%> (ø)
...s/graphql_flutter/lib/src/widgets/hooks/query.dart	100.00% <100.00%> (ø)
...ackages/graphql_flutter/lib/src/widgets/query.dart	100.00% <100.00%> (+5.40%)	:arrow_up:

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