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.

• I have read and understood the CONTRIBUTING guidelines
• My code is formatted (make check)
• I have run tests (make test)
• All commits in my PR conform to the commit hygiene section
• I have added relevant tests
• I have not added any dependencies

Additional context

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (547dd82) to head (e40d767).

Additional details and impacted files

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

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