Added CosmosSigner default implementation

[Kayanski]

This PR aims at making the TxBroadcaster available to other types of Signers that want to implement their own signing logic, very close to the CosmosSender signing logic.

This implementation is done to accomodate for Xion Senders that have a different signing mechanism

Checklist

• Changelog updated.
• Docs updated.

[cloudflare-workers-and-pages]

Deploying cw-orchestrator with    Cloudflare Pages

Latest commit:	fc63c02
Status:	✅  Deploy successful!
Preview URL:	https://4e8df1ee.cw-orchestrator.pages.dev
Branch Preview URL:	https://nicolas-orc-171-parse-respon.cw-orchestrator.pages.dev

View logs

[codecov]

Codecov Report

Attention: Patch coverage is 89.24051% with 17 lines in your changes missing coverage. Please review.

Project coverage is 56.8%. Comparing base (5fe212f) to head (7125879).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
cw-orch-daemon/src/senders/cosmos.rs	85.7%	8 Missing ⚠️
cw-orch-daemon/src/senders/sign.rs	92.8%	4 Missing ⚠️
cw-orch-daemon/src/tx_builder.rs	86.3%	3 Missing ⚠️
cw-orch-daemon/src/tx_broadcaster.rs	71.4%	2 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
cw-orch-daemon/src/senders/tx.rs	100.0% <100.0%> (ø)
cw-orch-daemon/src/tx_broadcaster.rs	75.7% <71.4%> (ø)
cw-orch-daemon/src/tx_builder.rs	71.1% <86.3%> (+0.1%)	⬆️
cw-orch-daemon/src/senders/sign.rs	92.8% <92.8%> (ø)
cw-orch-daemon/src/senders/cosmos.rs	43.0% <85.7%> (-14.2%)	⬇️

... and 5 files with indirect coverage changes

[Kayanski]

@CyberHoward had to modify the trait slightly to be able to merge with main and the corrected authz capabilities