fix!: move useSession hook to /client entry point

[jonas-jonas]

Related Issue or Design Document

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
  If this pull request addresses a security vulnerability,
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• I have added tests that prove my fix is effective or that my feature works.
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Further comments

[jonas-jonas]

This works very nicely with the next js middleware in #235

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 58.49%. Comparing base (d95a4ed) to head (51e73c8).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/elements-react/src/client/useSession.ts	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #255       +/-   ##
===========================================
+ Coverage   47.31%   58.49%   +11.18%     
===========================================
  Files          96       65       -31     
  Lines        1340      812      -528     
  Branches      183      104       -79     
===========================================
- Hits          634      475      -159     
+ Misses        701      332      -369     
  Partials        5        5               

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