refactor(opentelemetry-instrumentation-http): make _getConfig public and rename to getConfig

[mottibec]

Which problem is this PR solving?

• we are creating socket.io instrumentation at Aspecto.
  The problem occurs when socket.io uses polling as the transport method and sends an HTTP POST request, this causes a trace to be generated by the HTTP instrumentation.
  The workaround we thought about was to pass the instance of HttpInstrumentation to our socket.io instrumentation and modify the HttpInstrumentationConfig.ignoreIncomingPaths to include the path of the socket.io endpoint.
  In order to do that, we need to publicize the _getConfig method so we can merge the new config with the existing one and call setConfig.

Short description of the changes

• rename _getConfig to getConfig
• change access modifier from private to public

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Motti Bechhofer (c624e8d)

[obecny]

If I remember correctly the idea was to update main instrumentation package and make this method public on the Instrumentation level, instead of each individual instrumentation. I could swear we had a ticket for that.

[obecny]

here it is -> #2174

[codecov]

Codecov Report

Merging #2201 (c624e8d) into main (5dcec45) will increase coverage by 0.48%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2201      +/-   ##
==========================================
+ Coverage   92.27%   92.75%   +0.48%     
==========================================
  Files         122      141      +19     
  Lines        4066     5055     +989     
  Branches      833     1042     +209     
==========================================
+ Hits         3752     4689     +937     
- Misses        314      366      +52     

Impacted Files	Coverage Δ
...ges/opentelemetry-instrumentation-http/src/http.ts	95.61% <100.00%> (+0.79%)	⬆️
...e/src/baggage/propagation/HttpBaggagePropagator.ts	96.87% <0.00%> (-1.38%)	⬇️
...s/opentelemetry-tracing/src/BasicTracerProvider.ts	96.10% <0.00%> (-0.51%)	⬇️
...ckages/opentelemetry-core/src/utils/environment.ts	95.83% <0.00%> (ø)
...ges/opentelemetry-tracing/src/NoopSpanProcessor.ts
...ry-exporter-collector/src/CollectorExporterBase.ts	92.30% <0.00%> (ø)
...kages/opentelemetry-exporter-collector/src/util.ts	100.00% <0.00%> (ø)
...kages/opentelemetry-web/src/StackContextManager.ts	97.05% <0.00%> (ø)
...es/opentelemetry-context-zone-peer-dep/src/util.ts	100.00% <0.00%> (ø)
.../opentelemetry-exporter-collector/src/transform.ts	88.69% <0.00%> (ø)
... and 19 more

[rauno56]

@mottibec, would you like to take a stab at adding it to the base instrumentation class?

[mottibec]

@mottibec, would you like to take a stab at adding it to the base instrumentation class?

@rauno56 Sure, this looks like an excellent issue to start contributing to Otel.
done in #2224