Define map_blocklabels

[ogauthe]

This PR defines map_blocklabels as a GradedUnitRanges function. It is used to define flip, and removes the need for label_dual.

The next step is to remove map_blocklabels from SymmetrySectors, where it does not belong.

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.

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Files with missing lines	Patch %	Lines
src/gradedunitrangedual.jl	50.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #5   +/-   ##
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  Coverage        ?   76.08%           
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  Files           ?        8           
  Lines           ?      368           
  Branches        ?        0           
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  Hits            ?      280           
  Misses          ?       88           
  Partials        ?        0           

Flag	Coverage Δ
docs	0.00% <0.00%> (?)

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[mtfishman]

Looks good, thanks!

[mtfishman]

@ogauthe can you bump the version to v0.1.1 and register a new version? (I think as a practice we should do that for every PR, though of course we would bump the minor version if there are breaking changes.)