writer: Add retries with exponential backoff when signing fails

[bewakes]

Description

This PR adds an exponential backoff based retry when creating/signing of blob inscriptions fails. Currently, the task would fail whenever the inscription failed. Now it fails only if max retries exceeds.

Type of Change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature/Enhancement (non-breaking change which adds functionality or enhances an existing one)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update
• [x] Refactor
• [ ] New or updated tests

Checklist

• [ ] I have performed a self-review of my code.
• [ ] I have commented my code where necessary.
• [ ] I have updated the documentation if needed.
• [ ] My changes do not introduce new warnings.
• [ ] I have added tests that prove my changes are effective or that my feature works.
• [ ] New and existing tests pass with my changes.

Related Issues

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 8.00000% with 23 lines in your changes missing coverage. Please review.

Project coverage is 56.89%. Comparing base (a14d926) to head (920fd47). Report is 31 commits behind head on releases/0.1.0.

Files with missing lines	Patch %	Lines
crates/btcio/src/writer/task.rs	0.00%	23 Missing :warning:

@@                Coverage Diff                 @@
##           releases/0.1.0     #452      +/-   ##
==================================================
- Coverage           57.16%   56.89%   -0.28%     
==================================================
  Files                 256      263       +7     
  Lines               27048    28014     +966     
==================================================
+ Hits                15462    15938     +476     
- Misses              11586    12076     +490     

Files with missing lines	Coverage Δ
crates/btcio/src/writer/builder.rs	98.06% <ø> (-0.01%)	:arrow_down:
crates/btcio/src/writer/signer.rs	96.66% <100.00%> (+1.28%)	:arrow_up:
crates/btcio/src/writer/task.rs	30.85% <0.00%> (-2.75%)	:arrow_down:

... and 28 files with indirect coverage changes