Improve route harvesting

[grcevski]

The Java route harvester was parsing the output from the JVM with a scanner which is by default limited to 64K. On larger Java applications this buffer limit may not be enough for all symbols, so instead of extending the scanner to another limit, I re-wrote the code to directly parse the output buffer.

I also improved the loop that handles the partial Java routes by reducing the allocations required and I added an extra test for the edge case where the optimisation may not work:

Prior benchmark results:

goos: linux
goarch: amd64
pkg: go.opentelemetry.io/obi/pkg/components/transform/route
cpu: 12th Gen Intel(R) Core(TM) i7-1280P
BenchmarkPartialRouteMatcherSimple-20     	 1177230	       964.7 ns/op	     736 B/op	      20 allocs/op
BenchmarkPartialRouteMatcherComplex-20    	  355447	      3185 ns/op	    2040 B/op	      32 allocs/op

New benchmark results:

goos: linux
goarch: amd64
pkg: go.opentelemetry.io/obi/pkg/components/transform/route
cpu: 12th Gen Intel(R) Core(TM) i7-1280P
BenchmarkPartialRouteMatcherSimple-20     	 1369430	       833.6 ns/op	     496 B/op	      11 allocs/op
BenchmarkPartialRouteMatcherComplex-20    	  454360	      2606 ns/op	    1016 B/op	      12 allocs/op

[codecov]

Codecov Report

❌ Patch coverage is 85.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.48%. Comparing base (b523ed4) to head (aec664a).
⚠️ Report is 18 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/components/transform/route/part_matcher.go	76.47%	3 Missing and 1 partial ⚠️
pkg/components/transform/route/harvest/java.go	91.30%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #635      +/-   ##
==========================================
- Coverage   61.52%   61.48%   -0.04%     
==========================================
  Files         199      199              
  Lines       22086    22111      +25     
==========================================
+ Hits        13588    13596       +8     
- Misses       7527     7539      +12     
- Partials      971      976       +5     

Flag	Coverage Δ
integration-test-arm	34.43% <0.00%> (-0.11%)	⬇️
k8s-integration-test-1861-	?
k8s-integration-test-1893-	49.96% <0.00%> (?)
oats-test	37.16% <85.00%> (+0.03%)	⬆️

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[mariomac]

LGTM!!