Rework websockets

[Cryma]

• Add monotonically increasing ids to websocket messages
• Save websocket messages
• Split websocket server from REST backend
• Add continue-ability to continue abandoned sessions and replay messages

[codecov-commenter]

Codecov Report

Merging #14 (1a46047) into main (6e9a7bb) will increase coverage by 0.36%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   94.72%   95.09%   +0.36%     
==========================================
  Files          32       32              
  Lines         759      755       -4     
==========================================
- Hits          719      718       -1     
+ Misses         40       37       -3     

Impacted Files	Coverage Δ
ferrum-websocket/src/lib.rs	89.55% <100.00%> (+2.40%)	⬆️
ferrum-websocket/src/messages.rs	100.00% <100.00%> (ø)
ferrum-websocket/src/server.rs	81.91% <100.00%> (+0.86%)	⬆️
src/routes/channels/create_message.rs	100.00% <100.00%> (ø)

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