💥 [RUMF-730] use v2 events format

[bcaudan]

Motivation

Use the same event format as the one used to display the data.

Changes

Breaking:
Remove RUM event types export

Other:

• Remove v1 specific code + v2 references
• Remove v2_format feature flag
• fix loadEvent naming

Testing

automated tests

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I have gone over the contributing documentation.

[codecov-io]

Codecov Report

Merging #627 (283ca04) into master (f8c339b) will decrease coverage by 0.41%.
The diff coverage is 95.34%.

@@            Coverage Diff             @@
##           master     #627      +/-   ##
==========================================
- Coverage   87.78%   87.36%   -0.42%     
==========================================
  Files          56       54       -2     
  Lines        2578     2454     -124     
  Branches      556      515      -41     
==========================================
- Hits         2263     2144     -119     
+ Misses        315      310       -5     

Impacted Files	Coverage Δ
packages/rum/src/boot/rum.entry.ts	92.06% <ø> (ø)
packages/rum/src/boot/rum.ts	50.00% <0.00%> (-2.00%)	⬇️
packages/rum/src/domain/lifeCycle.ts	100.00% <ø> (ø)
...rc/domain/rumEventsCollection/view/trackTimings.ts	100.00% <ø> (ø)
packages/rum/src/domain/trackEventCounts.ts	100.00% <ø> (ø)
packages/rum/src/transport/batch.ts	77.77% <0.00%> (+2.77%)	⬆️
packages/rum/src/domain/assembly.ts	100.00% <100.00%> (ø)
packages/rum/src/domain/internalContext.ts	100.00% <100.00%> (ø)
packages/rum/src/domain/parentContexts.ts	98.24% <100.00%> (+2.65%)	⬆️
...ain/rumEventsCollection/action/actionCollection.ts	94.11% <100.00%> (-2.32%)	⬇️
... and 7 more

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[BenoitZugmeyer]

Looks good!