rename iter package to it

[jlc-christie]

Please provide a brief description of the change.

Renames the iter package to it as to not conflict with the standard library iter package.

Which issue does this change relate to?

119

Contribution checklist.

Replace the space in each box with "X" to check it off.

• [X] I have read and understood the CONTRIBUTING guidelines
• [X] My code is formatted (make check)
• [X] I have run tests (make test)
• [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 (547dd82) to head (e40d767).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v2 #123 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 16 16 Lines 322 322 ========================================= Hits 322 322 ```

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