Implement initialize_token

[td202]

Purpose

Part of RUN-15

Implement the initialize_token operation in the rust runtime.

Changes

• HostOperations: AccountAddress and Account passed by reference.
• Add HostOperationsExt trait that provides set_module_state.
• Implement initialize_token.

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 24.98%. Comparing base (9a53062) to head (978deeb).
⚠️ Report is 2 commits behind head on p10.

Additional details and impacted files

@@            Coverage Diff             @@
##              p10    #1465      +/-   ##
==========================================
- Coverage   25.02%   24.98%   -0.04%     
==========================================
  Files          34       34              
  Lines       10203    10203              
==========================================
- Hits         2553     2549       -4     
- Misses       7650     7654       +4     

see 2 files with indirect coverage changes

[github-actions]

The file size of the WebAssembly PLT deployment unit is 277248B.