feat: Temporary cap bitcoin-da fee rate

[jfldde]

Description

• Cap bitcoin-da fee rate via config. Defaults to 15 sat/vb

Linked Issues

• Fixes feat: batch proof sending stops over 15 sat/vbyte #2801

[codecov]

Codecov Report

❌ Patch coverage is 68.42105% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.8%. Comparing base (4342724) to head (23a4ee8).
⚠️ Report is 3 commits behind head on nightly.

Files with missing lines	Patch %	Lines
crates/bitcoin-da/src/service.rs	66.6%	6 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
crates/bitcoin-da/src/fee.rs	96.6% <100.0%> (+<0.1%)	⬆️
crates/bitcoin-da/src/service.rs	84.9% <66.6%> (-1.2%)	⬇️

... and 4 files with indirect coverage changes

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[rakanalh]

LGTM