✨[RUMF-430] enable new session strategy

[bcaudan]

cf #343

• Check page visibility every 1 minute to expand the session
• Add a session timeout at 4h
• Enforce the session expiration if last interaction was more than 15 minutes ago

[codecov-io]

Codecov Report

Merging #360 into master will decrease coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #360      +/-   ##
==========================================
- Coverage   86.91%   86.75%   -0.16%     
==========================================
  Files          29       29              
  Lines        1689     1684       -5     
  Branches      349      344       -5     
==========================================
- Hits         1468     1461       -7     
- Misses        221      223       +2     

Impacted Files	Coverage Δ
packages/core/src/sessionManagement.ts	100.00% <100.00%> (ø)
packages/logs/src/loggerSession.ts	100.00% <100.00%> (ø)
packages/rum/src/rumSession.ts	100.00% <100.00%> (ø)
packages/rum/src/rum.ts	88.42% <0.00%> (-2.11%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 14b7707...2c0a5ba. Read the comment docs.