Move around internal submodules for a more logical structure

[fjarri]

• Moved typed rounds machinery into its own submodule (rounds), to be used by cggmp21 and www02 (or whatever key resharing protocol we may implement later)
• Moved the key resharing protocol to www02 submodule, on the same level with cggmp21.
• Move session constructors to the top level out of the sessions submodule (which is a dynamic equivalent of rounds and shouldn't contain any protocol-specific things)

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Name	Status	Preview	Comments	Updated (UTC)
synedrion	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 16, 2024 11:56pm

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (3b789b0) 87.13% compared to head (781cf5c) 87.13%.

Files	Patch %	Lines
synedrion/src/sessions/states.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #97   +/-   ##
=======================================
  Coverage   87.13%   87.13%           
=======================================
  Files          45       45           
  Lines        7251     7251           
=======================================
  Hits         6318     6318           
  Misses        933      933           

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