chore: remove unused property in assets class

[samayer12]

Description

This PR removes the Assets.hash property and calculates the hash of a pepr module just before we need to provide that value to a consuming function. This will avoid potential issues with state and removes some dead code.

End to End Test:
(See Pepr Excellent Examples)

Related Issue

Fixes #1638

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Other (security config, docs update, etc)

Checklist before merging

• Unit, Journey, E2E Tests, docs, adr added or updated as needed
• Contributor Guide Steps followed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.40%. Comparing base (b1b6709) to head (ed4eb10).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1647   +/-   ##
=======================================
  Coverage   81.40%   81.40%           
=======================================
  Files          43       43           
  Lines        1979     1979           
  Branches      411      438   +27     
=======================================
  Hits         1611     1611           
  Misses        366      366           
  Partials        2        2