User specified number of significant figures for numbers in plots

[drbenvincent]

Closes #266.

The core functions (round_num and _format_sig_figs) are taken from the Arviz repo.

Tests are included.

I've re-run selected notebooks

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[juanitorduz]

LGTM but there is a doc-test failing ¯\(ツ)/¯

[drbenvincent]

Remote failing tests should hopefully be fixed whenever pymc-devs/pytensor#550 is fixed and make its way into a new pytensor release. Or when #279 is resolved. So don't sink any effort into trying to fix failing remote tests right now. You can of course ensure that all local tests pass - they are not affected by the issue. Not on my machine anyway.

[drbenvincent]

Well this is frustrating. Remote tests still not passing.

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (fc28a3b) 75.86% compared to head (198bde6) 76.27%.

Files	Patch %	Lines
causalpy/pymc_experiments.py	63.15%	7 Missing ⚠️
causalpy/skl_experiments.py	55.55%	4 Missing ⚠️
causalpy/utils.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #272      +/-   ##
==========================================
+ Coverage   75.86%   76.27%   +0.41%     
==========================================
  Files          20       20              
  Lines        1305     1332      +27     
==========================================
+ Hits          990     1016      +26     
- Misses        315      316       +1     

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