Add state bar

[iaraota]

This PR introduces a statebar configuration option, allowing users to choose to display the green/red bar for a selected state of time series plots in the "All" state tab.

Example

See this page for an example plot with the "Locked" state indicated by the bar. The configuration file should include:

[tab-blrms]
name = Ground motion BLRMS overview
statebar = Locked
shortname = Ground BLRMS overview
parent = SEI
...

[codecov]

Codecov Report

Attention: Patch coverage is 62.96296% with 10 lines in your changes missing coverage. Please review.

Project coverage is 49.30%. Comparing base (720bd0c) to head (fbd46f6).
Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
gwsumm/plot/builtin.py	16.67%	5 Missing ⚠️
gwsumm/tabs/data.py	57.14%	3 Missing ⚠️
gwsumm/tabs/builtin.py	84.62%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #416      +/-   ##
==========================================
- Coverage   49.64%   49.30%   -0.35%     
==========================================
  Files          60       60              
  Lines        8823     8810      -13     
==========================================
- Hits         4380     4343      -37     
- Misses       4443     4467      +24     

Flag	Coverage Δ
Linux	49.30% <62.96%> (-0.35%)	⬇️
macOS	49.30% <62.96%> (?)
python3.10	49.30% <62.96%> (-0.35%)	⬇️
python3.11	49.30% <62.96%> (-0.35%)	⬇️
python3.9	49.30% <62.96%> (-0.34%)	⬇️

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