Multiple Switches and Time Series DF Improvements

[zzink-nrel]

• Improve time series df creation speed
• Allow for multiple time series metadata as is the case for use of multiple time series with different feature values
• Handle loops with multiple switches contained in the loop.

Change Summary

Related issue number

Checklist

• The pull request title is a good summary of the changes.
• Tests for the changes exist
• Tests pass on CI
• Documentation reflects the changes where applicable
• My PR is ready to review, please add a comment including "please review" to assign reviewers

[AadilLatif]

Looks good overall, just two things:

1. In get_directed_graph — if switch_edges returns edges that aren't in the DFS tree (the warning branch), the cycle never gets broken and the while cycles: loop spins forever. You could pop the cycle off the list in that branch to be safe:

else:
    logger.warning(...)
    cycles.pop(0)
    continue

2. _get_timestamps return annotation still says -> list but the SingleTimeSeries branch now returns a pd.DatetimeIndex. Not blocking but worth fixing while you're in there.

Everything else is clean. The numpy-based df assembly is a nice perf win.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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