Add github.com/graph-gophers/graphql-go instrumentation

[MrAlias]

This new module instruments the github.com/graph-gophers/graphql-go module.

• Comply with OpenTelemetry semantic conventions (there are non currently)
• Package documentation
• Exported objects are documented
• Tests and linting are passing
• Includes dependabot config
• Library added to README.md
• CHANGELOG.md updated

[codecov-commenter]

Codecov Report

Merging #232 (de221aa) into main (ed64e83) will decrease coverage by 0.46%.
The diff coverage is 77.41%.

@@            Coverage Diff             @@
##             main     #232      +/-   ##
==========================================
- Coverage   77.47%   77.01%   -0.47%     
==========================================
  Files          45       47       +2     
  Lines        2087     2149      +62     
==========================================
+ Hits         1617     1655      +38     
- Misses        429      449      +20     
- Partials       41       45       +4     

Flag	Coverage Δ
Linux	77.01% <77.41%> (+0.01%)	⬆️
Windows	?
macOS	75.10% <77.41%> (+0.06%)	⬆️

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Impacted Files	Coverage Δ
.../graph-gophers/graphql-go/splunkgraphql/graphql.go	76.47% <76.47%> (ø)
...m/graph-gophers/graphql-go/splunkgraphql/option.go	81.81% <81.81%> (ø)
...n/github.com/lib/pq/splunkpq/internal/connector.go	51.75% <0.00%> (-5.03%)	⬇️

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