Provide ref and deref ops for Map

[BooleanCat]

Please provide a brief description of the change.

Other packages commonly use pointers as optionals for values. These helpers can help to manage those values cleanly with it.Map.

Which issue does this change relate to?

None.

Contribution checklist.

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

Additional context

None.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (b5f639d) to head (b09b5f2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #153   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           34        34           
  Lines          620       624    +4     
=========================================
+ Hits           620       624    +4     

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