feat(koa): Skip update HTTP's span name and update RpcMetadata's route instead

[chigia001]

Which problem is this PR solving?

Each framework has a different approach to updating Span's name and HTTP_ROUTE attribute. We want to delegate this to instrumentation-http for consistent's name and attribute
This PR fixes the above issue for koa when integrate with @koa/router as koa are not support routing natively.

• This will partially fix issue Setting HTTP_ROUTE inconsistent accross HTTP server frameworks #1381

Short description of the changes

• Skip modifying HTTP's Span name directly in instrumentation-koa code
• Update route property of RpcMetadata

[codecov]

Codecov Report

Merging #1567 (ef8a835) into main (eeda32a) will decrease coverage by 4.29%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1567      +/-   ##
==========================================
- Coverage   96.06%   91.77%   -4.29%     
==========================================
  Files          14      139     +125     
  Lines         914     7110    +6196     
  Branches      199     1426    +1227     
==========================================
+ Hits          878     6525    +5647     
- Misses         36      585     +549     

Files Changed	Coverage Δ
...lemetry-instrumentation-koa/src/instrumentation.ts	97.53% <100.00%> (ø)

... and 124 files with indirect coverage changes

[chigia001]

can we merge this or add pkg:instrumentation-koa label so we can test tav for this?

[blumamir]

This one is ready to merge, but the build seems to have an issue

lerna ERR! lifecycle "prepare" errored in "@opentelemetry/instrumentation-koa", exiting 1

Can you please take a look?

[chigia001]

My bad, forgot to remove unused import.