feat: backport Bitcoin inscription support

[lumtis]

Part of #2779

Add support for Bitcoin inscription and add fix for depositor fees: #2768

TODO: #2776

• Can be addressed after the testnet upgrade

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[github-actions]

!!!WARNING!!!
nosec detected in the following files: zetaclient/chains/bitcoin/fee.go, zetaclient/chains/bitcoin/rpc/rpc_live_test.go

Be very careful about using #nosec in code. It can be a quick way to suppress security warnings and move forward with development, it should be employed with caution. Suppressing warnings with #nosec can hide potentially serious vulnerabilities. Only use #nosec when you're absolutely certain that the security issue is either a false positive or has been mitigated in another way.

Only suppress a single rule (or a specific set of rules) within a section of code, while continuing to scan for other problems. To do this, you can list the rule(s) to be suppressed within the #nosec annotation, e.g: /* #nosec G401 */ or //#nosec G201 G202 G203
Broad #nosec annotations should be avoided, as they can hide other vulnerabilities. The CI will block you from merging this PR until you remove #nosec annotations that do not target specific rules.

Pay extra attention to the way #nosec is being used in the files listed above.

[codecov]

Codecov Report

Attention: Patch coverage is 7.59494% with 73 lines in your changes missing coverage. Please review.

Project coverage is 66.73%. Comparing base (4876df9) to head (6caa1ca).
Report is 1 commits behind head on release/v20.

Files with missing lines	Patch %	Lines
zetaclient/chains/bitcoin/fee.go	0.00%	30 Missing ⚠️
zetaclient/chains/bitcoin/rpc/rpc.go	0.00%	29 Missing ⚠️
zetaclient/chains/bitcoin/observer/inbound.go	14.28%	5 Missing and 1 partial ⚠️
zetaclient/chains/bitcoin/observer/witness.go	50.00%	4 Missing and 1 partial ⚠️
zetaclient/chains/solana/signer/withdraw.go	0.00%	2 Missing ⚠️
zetaclient/chains/bitcoin/observer/observer.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release/v20    #2825      +/-   ##
===============================================
- Coverage        66.88%   66.73%   -0.16%     
===============================================
  Files              364      364              
  Lines            20459    20510      +51     
===============================================
+ Hits             13684    13687       +3     
- Misses            6149     6195      +46     
- Partials           626      628       +2     

Files with missing lines	Coverage Δ
zetaclient/chains/bitcoin/observer/observer.go	33.22% <0.00%> (ø)
zetaclient/chains/solana/signer/withdraw.go	0.00% <0.00%> (ø)
zetaclient/chains/bitcoin/observer/witness.go	68.42% <50.00%> (-2.37%)	⬇️
zetaclient/chains/bitcoin/observer/inbound.go	14.39% <14.28%> (+0.10%)	⬆️
zetaclient/chains/bitcoin/rpc/rpc.go	0.00% <0.00%> (ø)
zetaclient/chains/bitcoin/fee.go	37.98% <0.00%> (-11.52%)	⬇️