feat(@opentelemetry-instrumentation-http): support adding custom attributes before a span is started

[echoontheway]

Which problem is this PR solving?

• support adding custom attributes before a span is started for opentelemetry-instrumentation-http
• help to use some custom fields to make the sample decision
• help to report some custom fields before a request/response

Short description of the changes

• add startIncomingSpanHook，startOutgoingSpanHook and corresponding test for opentelemetry-instrumentation-http

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ echoontheway (62c7099)

[vmarchaud]

lgtm

[codecov]

Codecov Report

Merging #2332 (0d393d9) into main (9c10bd7) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 0d393d9 differs from pull request most recent head c637254. Consider uploading reports for the commit c637254 to get more accurate results

@@            Coverage Diff             @@
##             main    #2332      +/-   ##
==========================================
- Coverage   92.77%   92.76%   -0.02%     
==========================================
  Files         145      145              
  Lines        5221     5226       +5     
  Branches     1070     1071       +1     
==========================================
+ Hits         4844     4848       +4     
- Misses        377      378       +1     

Impacted Files	Coverage Δ
...ges/opentelemetry-instrumentation-http/src/http.ts	94.98% <100.00%> (+0.09%)	⬆️
...es/opentelemetry-instrumentation-http/src/utils.ts	99.02% <100.00%> (ø)
...emetry-api-metrics/src/platform/node/globalThis.ts	0.00% <0.00%> (-100.00%)	⬇️

[Flarna]

Please describe the new options in the readme of the package.

[MSNev]

In the specs meeting it looks like there will be a different way to doing this (if I'm reading and listening correctly)

https://github.com/open-telemetry/oteps/blob/8335c9a53cdf3398075dd9523d3752522c0ece28/text/0165-instrumentation-api.md

[vmarchaud]

I believe i read it the same as you, this is welcome as a lot of instrumentation had some kind of system like this already. I believe this should be handled in the base instrumentation class though. I think it make sense to create a dedicated issue for this

[echoontheway]

👍
Before it's handled in the base instrumentation, will these startHooks for http be accepted? For I wanna use some custom fields to make the sample decision in my project. :)

[vmarchaud]

I think so

[echoontheway]

Please describe the new options in the readme of the package.

done :)

[vmarchaud]

@echoontheway Could you fix the conflicts ?

[echoontheway]

@echoontheway Could you fix the conflicts ?

done，sorry for late :)