Add type assertions when bridging assets

[sisyphusSmiling]

Related:

• Put assertions and post-conditions in the generic transactions flow-nft#222
• Put assertions and post-conditions in the generic transactions flow-ft#162

Description

Including these assertions for more robust transaction guarantees and consistency with standard best practices.

Related discord thread

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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 86.33%. Comparing base (02aab3f) to head (639da9f).
Report is 64 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
+ Coverage   86.19%   86.33%   +0.13%     
==========================================
  Files          18       17       -1     
  Lines         884      922      +38     
==========================================
+ Hits          762      796      +34     
- Misses        122      126       +4     

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