Integration: broadcast a withdrawal

[CAGS295]

Summary of Changes

Naive test for withdrawals.
Follow up on #215
Blocked #350

Testing

Risks

How were these changes tested?

What future testing should occur?

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[CAGS295]

blocked by #350

[codecov]

Codecov Report

Attention: 101 lines in your changes are missing coverage. Please review.

Comparison is base (6470223) 43.44% compared to head (805cba5) 43.03%.
Report is 4 commits behind head on main.

Files	Patch %	Lines
romeo/src/stacks_client.rs	0.00%	36 Missing ⚠️
sbtc-cli/src/commands/withdraw.rs	0.00%	21 Missing ⚠️
sbtc-cli/src/main.rs	0.00%	18 Missing ⚠️
stacks-core/src/address.rs	0.00%	13 Missing ⚠️
sbtc-cli/src/commands/deposit.rs	0.00%	10 Missing ⚠️
sbtc-cli/src/commands/broadcast.rs	0.00%	2 Missing ⚠️
romeo/src/system.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #351      +/-   ##
==========================================
- Coverage   43.44%   43.03%   -0.41%     
==========================================
  Files          45       45              
  Lines        5467     5519      +52     
  Branches       47       47              
==========================================
  Hits         2375     2375              
- Misses       3091     3143      +52     
  Partials        1        1              

Flag	Coverage Δ
unittests	76.61% <ø> (ø)

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