CLI: Support dumping the TX message in sign-only mode

[t-nelson]

Problem

No way to output the binary transaction message with CLI

Summary of Changes

Add a flag to output the base64-encoded transaction message in sign-only mode

Fixes #15786

[CriesofCarrots]

lgtm

[CriesofCarrots]

How do you want to handle updating spl-token-cli?

Pull request has been modified.

[t-nelson]

How do you want to handle updating spl-token-cli?

I'll do it once 1.5.15 crates are live. So much less plumbing there. The itch to refactor CLI similarly is getting strong now

[CriesofCarrots]

I'll do it once 1.5.15 crates are live. So much less plumbing there. The itch to refactor CLI similarly is getting strong now

Ya, just don't think this will pass downstream-projects due to the return_signers() signature change

[t-nelson]

I'll do it once 1.5.15 crates are live. So much less plumbing there. The itch to refactor CLI similarly is getting strong now

Ya, just don't think this will pass downstream-projects due to the return_signers() signature change

Countdown to SPL in monorepo...

[t-nelson]

Ya, just don't think this will pass downstream-projects due to the return_signers() signature change

I'm adding a return_signers_with_config(), return_signers() will just wrap it with defaults. Re-plumbing CLI now 🤕

[codecov]

Codecov Report

Merging #15834 (ed4f155) into master (821be88) will decrease coverage by 0.0%.
The diff coverage is 59.8%.

@@            Coverage Diff            @@
##           master   #15834     +/-   ##
=========================================
- Coverage    80.0%    79.9%   -0.1%     
=========================================
  Files         409      409             
  Lines      106389   106636    +247     
=========================================
+ Hits        85163    85303    +140     
- Misses      21226    21333    +107