Offline wrapper signing

[grarco]

Describe your changes

Closes #3875.

Updates the client and the SDK (in a breaking manner) to:

• Selectively dump a raw or a wrapper tx
• Produce an offline signature for a wrapper transaction (gas payment)
• Allow loading a wrapper signature when building a custom tx

Some misc updates to allow the ones above:

• Reworked requirements and conflicts of some CLI args
• Changed the owner arg to be optional for custom tx and offline signing
• build_custom optionally returns SigningTxData (it returns None if all the signatures have been provided from file)
• Updated tests

I've also opened #3901 as a possible followup to this PR.

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

[codecov]

Codecov Report

Attention: Patch coverage is 84.94624% with 14 lines in your changes missing coverage. Please review.

Project coverage is 73.99%. Comparing base (c465b7d) to head (f80e02e).
Report is 20 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/sdk/src/tx.rs	90.19%	5 Missing ⚠️
crates/sdk/src/lib.rs	40.00%	3 Missing ⚠️
crates/sdk/src/signing.rs	90.90%	3 Missing ⚠️
crates/apps_lib/src/config/genesis/transactions.rs	0.00%	2 Missing ⚠️
crates/sdk/src/args.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3900      +/-   ##
==========================================
- Coverage   74.02%   73.99%   -0.04%     
==========================================
  Files         341      341              
  Lines      106560   106608      +48     
==========================================
+ Hits        78879    78880       +1     
- Misses      27681    27728      +47     

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[mergify]

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