✨ [RUMF-772] add beforeSend API

[bcaudan]

Motivation

Provide an API to modified fields that can contain sensitive data before sending them to our server:

ex:

DD_RUM.init({
  ...,
  beforeSend: (event) => {
    // remove email from view url
    event.view.url = event.view.url.replace(/email=[^&]*/, "email=REDACTED")
  },
  ...
})

Only the following fields are updatable:

• RUM
  • view.url
  • view.referrer
  • action.target.name
  • error.message
  • error.stack
  • error.resource.url
  • resource.url
• Logs
  • view.url
  • view.referrer
  • message
  • error.stack
  • http.url

Changes

• new limitModification core method
• document logsEventsFormat
• add beforeSend API for rum and logs

Testing

automated tests + sandbox tests

---

I have gone over the contributing documentation.

[codecov-io]

Codecov Report

Merging #644 (5567244) into master (0fb8bde) will increase coverage by 0.10%.
The diff coverage is 97.01%.

@@            Coverage Diff             @@
##           master     #644      +/-   ##
==========================================
+ Coverage   87.50%   87.60%   +0.10%     
==========================================
  Files          54       55       +1     
  Lines        2464     2510      +46     
  Branches      509      517       +8     
==========================================
+ Hits         2156     2199      +43     
- Misses        308      311       +3     

Impacted Files	Coverage Δ
packages/core/src/domain/configuration.ts	90.41% <ø> (ø)
packages/logs/src/boot/logs.entry.ts	100.00% <ø> (ø)
packages/rum/src/boot/rum.entry.ts	92.06% <ø> (ø)
packages/rum/src/domain/internalContext.ts	100.00% <ø> (ø)
packages/rum/src/domain/lifeCycle.ts	100.00% <ø> (ø)
packages/rum/src/domain/parentContexts.ts	98.24% <ø> (ø)
packages/rum/src/domain/trackEventCounts.ts	100.00% <ø> (ø)
packages/rum/src/rawRumEvent.types.ts	100.00% <ø> (ø)
packages/rum/test/fixtures.ts	100.00% <ø> (ø)
packages/logs/src/boot/logs.ts	71.11% <94.44%> (+2.53%)	⬆️
... and 10 more

---

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[BenoitZugmeyer]

Looks great!