fix crypto import

[shamilovtim]

i missed fixing this breaking change when i bumped web5 dids

• added an assertion that would have caught the bug
• added explicit dependency on web5/crypto because its there and was hidden

[codecov-commenter]

Codecov Report

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

Project coverage is 95.08%. Comparing base (1c6246f) to head (d018c6a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #161 +/- ## ======================================= Coverage 95.08% 95.08% ======================================= Files 28 28 Lines 2951 2951 Branches 395 395 ======================================= Hits 2806 2806 Misses 144 144 Partials 1 1 ```

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