Create asset.rs

[tsmbland]

Description

Simply moving the assets code from agent.rs to a new asset.rs file, as I think it's cleaner this way

Type of change

• Bug fix (non-breaking change to fix an issue)
• New feature (non-breaking change to add functionality)
• Refactoring (non-breaking, non-functional change to improve maintainability)
• Optimization (non-breaking change to speed up the code)
• Breaking change (whatever its nature)
• Documentation (improve or add documentation)

Key checklist

• All tests pass: $ cargo test
• The documentation builds and looks OK: $ cargo doc

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

Attention: Patch coverage is 98.30508% with 4 lines in your changes missing coverage. Please review.

Project coverage is 95.11%. Comparing base (076966c) to head (6eea1d8).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/asset.rs	98.30%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #469   +/-   ##
=======================================
  Coverage   95.11%   95.11%           
=======================================
  Files          32       33    +1     
  Lines        4752     4752           
  Branches     4752     4752           
=======================================
  Hits         4520     4520           
  Misses        119      119           
  Partials      113      113           

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[alexdewar]

LGTM. I think this makes more sense too -- the assets stuff ended up growing until it took over agent.rs a bit.