Demonstration of new getList() method on the TextMapGetter #12581
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Demonstrates proposed spec changes
Implements getList() in the Spring Web MVC instrumentation's JakartaHttpServletRequestGetter.
Implements a test to demonstrate the new W3CBaggagePropagator working with multiple baggage headers (using a locally published version of opentelemetry-api and opentelemetry-context, which contains the changes to the textmapgetter interface and baggage propagator).
The TextMapGetter operates on a Jakarta servlet HttpServletRequest, a very common interface used in many servers. This demonstrates that using getList() should work in many area / servers.
The build will obviously not pass because it's relying on local SNAPSHOT changes that aren't merged to main in
opentelemetry-java