feat(instrumentation-xhr): add applyCustomAttributesOnSpan hook

[mhennoch]

We've had couple of asks to add custom attributes to already autoinstrumented XHR. It seems fetch already has this functionality #2071. There is a little annoyance that I can't make the hook function parameters the same as there is no separate Request and Response available in XHR. So the hook has span and xhr reference.

Added tests for different fail types(maybe overkill).

[codecov]

Codecov Report

Merging #2134 (e4c8e33) into main (f077df3) will increase coverage by 0.03%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main    #2134      +/-   ##
==========================================
+ Coverage   92.76%   92.79%   +0.03%     
==========================================
  Files         140      140              
  Lines        4987     4998      +11     
  Branches     1029     1032       +3     
==========================================
+ Hits         4626     4638      +12     
+ Misses        361      360       -1     

Impacted Files	Coverage Δ
...emetry-instrumentation-xml-http-request/src/xhr.ts	96.58% <90.90%> (-0.33%)	⬇️
...ckages/opentelemetry-exporter-jaeger/src/jaeger.ts	88.75% <0.00%> (+1.25%)	⬆️
...emetry-core/src/platform/node/RandomIdGenerator.ts	93.75% <0.00%> (+6.25%)	⬆️

[obecny]

lgtm, the additional level with describe looks nice on html report when they are joined with some AND / OR dependency - this is just suggestion not a blocker. Thx for more tests :)

[CAaRrLl]

We've had couple of asks to add custom attributes to already autoinstrumented XHR. It seems fetch already has this functionality #2071. There is a little annoyance that I can't make the hook function parameters the same as there is no separate Request and Response available in XHR. So the hook has span and xhr reference.

I want to add the request body to span attributes, but the xhr reference can not seem to get the request body. Is there a good solution for it? :)