Made tcp connection context-aware

[pompon0]

This simplifies usage of the connection (connection errors are not leaked all over the place) at the cost of running a background task for connection management. Additionally:

• added a NodeSecretKey/NodePublicKey wrappers of ed25519 keys, which can be solely used for connection authentication (domain separation from validator keys)
• rewritten (deprecated) protoio to handle context-aware connections
• moved authentication from SecretConnection to Router.handshake, which will eventually also handle handshaking the giga p2p connections.
• Moved p2p proto messages to use the the upstream proto generator.
• renamed import from "proto" to (deprecated) "gogoproto" within sei-tendermint/internal to avoid collision with the upstream proto library that will replace gogoproto.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jan 21, 2026, 5:30 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.88%. Comparing base (723d44e) to head (b7d617a).

Additional details and impacted files

@@               Coverage Diff               @@
##           gprusak-mux    #2718      +/-   ##
===============================================
- Coverage        43.89%   42.88%   -1.01%     
===============================================
  Files             1914     1565     -349     
  Lines           159379   125227   -34152     
===============================================
- Hits             69952    53703   -16249     
+ Misses           83000    66639   -16361     
+ Partials          6427     4885    -1542     

Flag	Coverage Δ
sei-chain	45.90% <ø> (+<0.01%)	⬆️
sei-cosmos	38.20% <ø> (-0.01%)	⬇️
sei-db	69.43% <ø> (ø)
sei-tendermint	?

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