chore: move sdk-node to experimental

[dyladan]

Because this package depends on experimental and contrib packages it cannot go to stable. We should also have discussions about it's final API. I would like to make it sync if possible.

[codecov]

Codecov Report

Merging #2473 (f8a533c) into main (3a81389) will increase coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2473      +/-   ##
==========================================
+ Coverage   93.09%   93.20%   +0.10%     
==========================================
  Files         127      137      +10     
  Lines        4504     5017     +513     
  Branches      942     1060     +118     
==========================================
+ Hits         4193     4676     +483     
- Misses        311      341      +30     

Impacted Files	Coverage Δ
...telemetry-sdk-trace-web/src/StackContextManager.ts	94.28% <0.00%> (ø)
packages/opentelemetry-sdk-trace-web/src/types.ts	100.00% <0.00%> (ø)
.../opentelemetry-exporter-collector/src/transform.ts	88.69% <0.00%> (ø)
...ages/opentelemetry-exporter-collector/src/types.ts	100.00% <0.00%> (ø)
...entelemetry-sdk-trace-web/src/WebTracerProvider.ts	100.00% <0.00%> (ø)
...lemetry-exporter-collector/src/transformMetrics.ts	95.71% <0.00%> (ø)
packages/opentelemetry-sdk-trace-web/src/utils.ts	94.90% <0.00%> (ø)
...-sdk-trace-web/src/enums/PerformanceTimingNames.ts	100.00% <0.00%> (ø)
...kages/opentelemetry-exporter-collector/src/util.ts	100.00% <0.00%> (ø)
...ry-exporter-collector/src/CollectorExporterBase.ts	92.15% <0.00%> (ø)