Add validation for number of datetimes in Temporal.interval

[lukas-phaf]

(Copy of PR #17)

Addresses and resolves the existing TODO comment for validating temporal list lengths.

Currently, the interval field of the Temporal data class doesn't validate the number of datetimes that are provided. Per the specification, each interval should consist of exactly two datetime strings, so we should change the interval from:

interval: List[List[AwareDatetime]]

to:

interval: List[Annotated[List[AwareDatetime], Len(min_length=2, max_length=2)]]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.04%. Comparing base (84d6c16) to head (1df0127).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   98.02%   98.04%   +0.01%     
==========================================
  Files          10       10              
  Lines         203      205       +2     
==========================================
+ Hits          199      201       +2     
  Misses          4        4              

Flag	Coverage Δ
unittests	98.04% <100.00%> (+0.01%)	⬆️

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