⚗ [RUMF-878] add startView API

[bcaudan]

Motivation

First step in the manual view naming strategy

Changes

behind view-renaming flag, introduce new API:

DD_RUM.startView(name?: string)

Allowing to manually start a new view with an optional name

Testing

unit / manual

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I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #850 (4790c91) into main (f5e2550) will decrease coverage by 0.38%.
The diff coverage is 84.61%.

@@            Coverage Diff             @@
##             main     #850      +/-   ##
==========================================
- Coverage   88.96%   88.57%   -0.39%     
==========================================
  Files          80       80              
  Lines        3642     3651       +9     
  Branches      804      806       +2     
==========================================
- Hits         3240     3234       -6     
- Misses        402      417      +15     

Impacted Files	Coverage Δ
packages/rum-core/src/boot/rum.ts	29.16% <14.28%> (-22.84%)	⬇️
packages/core/src/tools/boundedBuffer.ts	100.00% <100.00%> (ø)
packages/logs/src/boot/logs.entry.ts	100.00% <100.00%> (ø)
packages/rum-core/src/boot/rumPublicApi.ts	94.62% <100.00%> (+0.37%)	⬆️
.../src/domain/rumEventsCollection/view/trackViews.ts	97.77% <100.00%> (+0.10%)	⬆️
...omain/rumEventsCollection/error/errorCollection.ts	80.00% <0.00%> (-15.00%)	⬇️
...ckages/core/src/domain/automaticErrorCollection.ts	86.20% <0.00%> (-12.07%)	⬇️

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[BenoitZugmeyer]

This seems like a good start. Two notes:

• I think we should ensure that the initial document resource is attached to the initial view instead of the latest created view, since now views can be created before init(). It should be the case, but a unit test to ensure it could be nice.

• I'm mitigated about the function name. I kind of liked newView. What made you change your mind from the RFC proposal?

[BenoitZugmeyer]

Nice !