Revert "[RUMF-617] integrate tracing (#461)"

[bcaudan]

Motivation

setback in tracing strategy, in wait of a clearer strategy

Changes

reverts commit 5d7a689

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I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #499 into master will decrease coverage by 0.60%.
The diff coverage is 96.55%.

@@            Coverage Diff             @@
##           master     #499      +/-   ##
==========================================
- Coverage   88.04%   87.44%   -0.61%     
==========================================
  Files          36       34       -2     
  Lines        2209     2111      -98     
  Branches      432      416      -16     
==========================================
- Hits         1945     1846      -99     
- Misses        264      265       +1     

Impacted Files	Coverage Δ
packages/core/src/configuration.ts	83.33% <ø> (+2.89%)	⬆️
packages/rum/src/rum.ts	86.04% <ø> (-3.96%)	⬇️
packages/rum/src/requestCollection.ts	96.87% <93.75%> (-3.13%)	⬇️
packages/core/src/fetchProxy.ts	97.72% <100.00%> (-0.15%)	⬇️
packages/core/src/xhrProxy.ts	100.00% <100.00%> (ø)
packages/rum/src/rum.entry.ts	73.21% <100.00%> (-0.47%)	⬇️

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