Ignore max_fee field during fee estimation

[xqft]

Ignore max_fee field during fee estimation

Description

Closes #870. This change makes estimate_fee() create a tx with a maximum max_fee.

Checklist

• Linked to Github Issue
• Unit tests added

[codecov-commenter]

Codecov Report

Merging #869 (14e998e) into main (cdf9880) will increase coverage by 0.00%.
The diff coverage is 95.00%.

@@           Coverage Diff           @@
##             main     #869   +/-   ##
=======================================
  Coverage   91.78%   91.79%           
=======================================
  Files          54       54           
  Lines       12939    12986   +47     
=======================================
+ Hits        11876    11920   +44     
- Misses       1063     1066    +3     

Files Changed	Coverage Δ
src/transaction/declare.rs	93.50% <75.00%> (-0.11%)	⬇️
src/transaction/declare_v2.rs	83.72% <75.00%> (-0.06%)	⬇️
src/transaction/deploy_account.rs	88.85% <75.00%> (-0.15%)	⬇️
src/lib.rs	98.73% <100.00%> (+0.02%)	⬆️
src/transaction/invoke_function.rs	99.57% <100.00%> (+<0.01%)	⬆️
src/transaction/mod.rs	93.22% <100.00%> (+2.74%)	⬆️