Add sqlx instrumentation

[MrAlias]

This new module instruments the github.com/jmoiron/sqlx package. The instrumentation wraps the "github.com/jmoiron/sqlx".DB using the already existing github.com/signalfx/splunk-otel-go/instrumentation/database/sql/splunksql instrumentation.

• Comply with OpenTelemetry database semantic conventions (done using the already compliant github.com/signalfx/splunk-otel-go/instrumentation/database/sql/splunksql instrumentation)
• Package documentation
• Exported objects are documented
• Tests and linting are passing
• Includes dependabot config
• Library added to README.md

[codecov-commenter]

Codecov Report

Merging #93 (8357066) into main (399ffb9) will decrease coverage by 0.10%.
The diff coverage is 70.37%.

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
- Coverage   87.28%   87.18%   -0.11%     
==========================================
  Files          17       18       +1     
  Lines         535      562      +27     
==========================================
+ Hits          467      490      +23     
- Misses         49       53       +4     
  Partials       19       19              

Flag	Coverage Δ
Linux	87.18% <70.37%> (-0.11%)	⬇️
Windows	87.18% <70.37%> (-0.11%)	⬇️
macOS	87.18% <70.37%> (-0.11%)	⬇️

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Impacted Files	Coverage Δ
...entation/github.com/jmoiron/sqlx/splunksqlx/sql.go	70.37% <70.37%> (ø)
instrumentation/database/sql/splunksql/config.go	85.50% <0.00%> (+0.72%)	⬆️
instrumentation/database/sql/splunksql/sql.go	87.17% <0.00%> (+7.69%)	⬆️

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[pellared]

👍

I think we only miss a notice in CHANGELOG