♻️ [RUMF-1083] introduce session context history

[bcaudan]

Motivation

Third part of session management rework, cf #1166, #1180

Changes

• move ContextHistory to core
• expose sessionStore.expireObservable
• store session context history in session management
• use session history in RUM and Logs

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[BenoitZugmeyer]

This looks great!

Maybe we could change the session API a bit to have something like:

interface SessionHistory {
  findSession(date: RelativeTime): { isTracked(): boolean, getId(): boolean, ...}
}

So when accessing multiple attributes from the same session we don't have to look for it through the history every time:

const session = sessionHistory.findSession(startTime) 
if (session.isTracked()) {
  ...
  session: { id: session.getId()! }
}

We could also imagine having a session type like:

type Session<T> = {
  tracked: true,
  id: string,
  replayPlan: boolean
} | {
  tracked: false,
  replayPlan: false,
}

[codecov-commenter]

Codecov Report

Merging #1187 (1bb1d7d) into main (6858d86) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1187      +/-   ##
==========================================
+ Coverage   88.85%   88.98%   +0.12%     
==========================================
  Files         100      100              
  Lines        4270     4293      +23     
  Branches      971      975       +4     
==========================================
+ Hits         3794     3820      +26     
+ Misses        476      473       -3     

Impacted Files	Coverage Δ
packages/core/src/tools/contextHistory.ts	100.00% <ø> (ø)
packages/logs/src/domain/logger.ts	94.73% <ø> (ø)
packages/rum-core/src/domain/urlContexts.ts	100.00% <ø> (ø)
packages/rum-core/src/rawRumEvent.types.ts	100.00% <ø> (ø)
...kages/core/src/domain/session/sessionManagement.ts	100.00% <100.00%> (ø)
packages/core/src/domain/session/sessionStore.ts	100.00% <100.00%> (ø)
packages/logs/src/boot/startLogs.ts	93.18% <100.00%> (+0.15%)	⬆️
packages/logs/src/domain/loggerSession.ts	100.00% <100.00%> (+4.34%)	⬆️
packages/rum-core/src/boot/startRum.ts	43.33% <100.00%> (ø)
packages/rum-core/src/domain/assembly.ts	100.00% <100.00%> (ø)
... and 6 more

---

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[bcaudan]

Maybe we could change the session API a bit to have something like:

interface SessionHistory {
  findSession(date: RelativeTime): { isTracked(): boolean, getId(): boolean, ...}
}

@BenoitZugmeyer that looks interesting, I'd be in favor of exploring it in a following PR though

[BenoitZugmeyer]

LGTM!