Fractional Time Component Representations

[PacificBird]

This pull request adds helper methods on Time, PrimitiveDateTime, and OffsetDateTime to obtain fractional time component representations for hours, minutes, and seconds.

For example, time!(01:30:00.0000).fractional_hour() == 1.5, time!(01:30:30.0000).fractional_hour() == 30.5, and so on.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.1%. Comparing base (646dbe2) to head (a15aade).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
time/src/time.rs	0.0%	14 Missing ⚠️
time/src/offset_date_time.rs	0.0%	9 Missing ⚠️
time/src/primitive_date_time.rs	0.0%	9 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #763     +/-   ##
=======================================
- Coverage   95.4%   95.1%   -0.3%     
=======================================
  Files         95      95             
  Lines       9686    9718     +32     
=======================================
+ Hits        9242    9244      +2     
- Misses       444     474     +30     

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[jhpratt]

What's the use case here? Off-hand, I feel like this is best represented by a Duration constructed by subtracting Time::MIDNIGHT.