Fix type hints

[hoh]

• Fix: Typing of item hashes were str not ItemHash
• Fix: Typing: Protocol AccountFromPrivateKey lacked method sign_raw

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.17%. Comparing base (fd1b0e1) to head (68f1a47). Report is 1 commits behind head on main.

:exclamation: Current head 68f1a47 differs from pull request most recent head bd6f43d

Please upload reports for the commit bd6f43d to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #121 +/- ## ========================================== + Coverage 84.15% 84.17% +0.01% ========================================== Files 27 27 Lines 1130 1131 +1 Branches 188 188 ========================================== + Hits 951 952 +1 Misses 176 176 Partials 3 3 ```

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[github-actions[bot]]

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