Update fee estimate

[sisyphusSmiling]

Closes: #125

Description

• Updates bridge fee estimation, setting a withdrawable upper bound on the ScopedFTProvider based on the upper bound of bytes we would expect to move in a single transaction <- credit to @bluesign for the idea & consult

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For contributor use:

• Targeted PR against main branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the standards mentioned here.
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.73%. Comparing base (02aab3f) to head (d043d98).
Report is 170 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #133      +/-   ##
==========================================
+ Coverage   86.19%   86.73%   +0.53%     
==========================================
  Files          18       18              
  Lines         884      965      +81     
==========================================
+ Hits          762      837      +75     
- Misses        122      128       +6     

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