feat: refactor http operation metrics to handle multiple frameworks

[tim-mwangi]

Description

This is to be able to send the correct operation name from the various frameworks including gorilla mux. Also, remove the otel metrics specific code from the sdk.

Testing

• Tested locally

Checklist:

• [✅ ] My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• [✅ ] Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

Merging #202 (e66a39a) into main (c886e58) will decrease coverage by 6.80%.
The diff coverage is 33.26%.

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
- Coverage   64.99%   58.19%   -6.80%     
==========================================
  Files          49       55       +6     
  Lines        1774     2220     +446     
==========================================
+ Hits         1153     1292     +139     
- Misses        570      868     +298     
- Partials       51       60       +9     

Impacted Files	Coverage Δ
...nstrumentation/hypertrace/net/hyperhttp/handler.go	0.00% <0.00%> (ø)
instrumentation/opencensus/metrics.go	0.00% <0.00%> (ø)
...ntation/opentelemetry/batchspanprocessor/logger.go	0.00% <0.00%> (ø)
instrumentation/opentelemetry/metrics.go	0.00% <0.00%> (ø)
...atchspanprocessor/batch_span_processor.modified.go	15.67% <15.67%> (ø)
...n/opentelemetry/batchspanprocessor/env.modified.go	30.23% <30.23%> (ø)
instrumentation/opentelemetry/init_additional.go	79.10% <70.00%> (+1.32%)	⬆️
instrumentation/opentelemetry/init.go	81.18% <78.04%> (-1.33%)	⬇️
...nstrumentation/opencensus/net/hyperhttp/handler.go	100.00% <100.00%> (ø)
...ion/opentelemetry/batchspanprocessor/bspcreator.go	100.00% <100.00%> (ø)
... and 5 more

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