Export IS.get_time_series_summary_table

[scdhulipala]

• Export IS.get_time_series_summary_table to be used by SiennaPRASInterface and also prints length when system time series summary is pretty printed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.79%. Comparing base (9fd6573) to head (271a120).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1287   +/-   ##
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  Coverage   83.79%   83.79%           
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  Files         184      184           
  Lines        8529     8529           
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  Hits         7147     7147           
  Misses       1382     1382           

Flag	Coverage Δ
unittests	83.79% <ø> (ø)

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Files with missing lines	Coverage Δ
src/PowerSystems.jl	0.00% <ø> (ø)