Add instrumentation for confluent-kafka-go

[MrAlias]

This new module instruments the built-inconfluent-kafka-go/kafka package. This instrumentation wraps the Consumer and Producer from the instrumented package. Kafka messages received and sent, both synchronously and asynchronously, are traced. The message headers are used to propagate trace context with a configurable TextMapPropagtor.

• Comply with OpenTelemetry database semantic conventions
• Package documentation
• Exported objects are documented
• Tests and linting are passing
• Includes dependabot config
• Library added to README.md

[codecov-commenter]

Codecov Report

Merging #100 (ba6c12c) into main (ecebf9c) will increase coverage by 2.19%.
The diff coverage is 90.74%.

@@            Coverage Diff             @@
##             main     #100      +/-   ##
==========================================
+ Coverage   81.32%   83.52%   +2.19%     
==========================================
  Files          23       27       +4     
  Lines         889     1159     +270     
==========================================
+ Hits          723      968     +245     
- Misses        134      155      +21     
- Partials       32       36       +4     

Flag	Coverage Δ
Linux	82.65% <90.74%> (+2.45%)	⬆️
Windows	80.65% <ø> (ø)
macOS	?

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Impacted Files	Coverage Δ
...c/confluent-kafka-go/kafka/splunkkafka/producer.go	87.50% <87.50%> (ø)
...c/confluent-kafka-go/kafka/splunkkafka/consumer.go	88.42% <88.42%> (ø)
...nc/confluent-kafka-go/kafka/splunkkafka/carrier.go	100.00% <100.00%> (ø)
...inc/confluent-kafka-go/kafka/splunkkafka/config.go	100.00% <100.00%> (ø)

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[MrAlias]

@pellared thoughts on how we can exclude this package from being built on certain systems? confluent-kafka-go is not supported on Windows and it looks like Ubuntu 20.04 does not have a build of librdkafka-dev for i386 machine architecture.

[pellared]

@pellared thoughts on how we can exclude this package from being built on certain systems? confluent-kafka-go is not supported on Windows and it looks like Ubuntu 20.04 does not have a build of librdkafka-dev for i386 machine architecture.

To handle Windows, I would try adding the following build constraint to all files:

// +build !linux

package ...

For Ubuntu, I would add a step in GH workflow to install the package in the jobs where it is needed.

[MrAlias]

For Ubuntu, I would add a step in GH workflow to install the package in the jobs where it is needed.

Tried that. The package could not be found :|

[MrAlias]

// +build !linux

Guessing you meant // +build !windows. This does not work though: level=error msg="Running error: context loading failed: no go files to analyze".