[Cleanup] Move http request read from `@JWT` and `@UseSessions` into separate functions

[LoicPoullain]

Issue

@JWT and @UseSessions are big functions with a lot of tests. It is hard to add new features to them without providing a lot of work.

Solution and steps

• [x] Move http request read from @JWT and @UseSessions into separate functions

Checklist

• [x] Add/update/check docs (code comments and docs/ folder).
• [x] Add/update/check tests.
• [x] Update/check the cli generators.

[codecov-commenter]

Codecov Report

Merging #1107 (b09082a) into v3-0-0 (fffbb91) will decrease coverage by 0.05%. The diff coverage is 96.96%.

@@            Coverage Diff             @@
##           v3-0-0    #1107      +/-   ##
==========================================
- Coverage   98.87%   98.82%   -0.06%     
==========================================
  Files          84       85       +1     
  Lines        1693     1705      +12     
  Branches      405      408       +3     
==========================================
+ Hits         1674     1685      +11     
- Misses         19       20       +1     

Impacted Files	Coverage Δ
packages/core/src/sessions/use-sessions.hook.ts	98.79% <90.00%> (-1.21%)	:arrow_down:
...e/src/sessions/http/get-session-id-from-request.ts	100.00% <100.00%> (ø)

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