Remove Unzip

[BooleanCat]

Please provide a brief description of the change.

There's an issue with Unzip where calling the iterator more than once results in race conditions such as its waitgroup done values getting negative.

Rather than spend a long time fixing it I'd rather ship 2.0.0 without Unzip and add it back later.

Which issue does this change relate to?

N/A.

Contribution checklist.

• [x] I have read and understood the CONTRIBUTING guidelines
• [x] All commits in my PR conform to the commit hygiene section
• [x] I have added relevant tests
• [x] I have not added any dependencies

Additional context

N/A.

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (ec3f67d) to head (76e35b8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #128 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 32 31 -1 Lines 438 367 -71 ========================================= - Hits 438 367 -71 ```

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