FIX-#447: Add show_versions helper for debugging

[cgarciae]

Overview

Adds a show_versions() function that prints the lux, pandas, and luxwidget versions. We can ask for this information for debugging.

[codecov]

Codecov Report

Merging #450 (7b5a38f) into master (a7e2cf7) will decrease coverage by 0.15%.
The diff coverage is 30.00%.

@@            Coverage Diff             @@
##           master     #450      +/-   ##
==========================================
- Coverage   65.65%   65.49%   -0.16%     
==========================================
  Files          55       56       +1     
  Lines        4440     4460      +20     
==========================================
+ Hits         2915     2921       +6     
- Misses       1525     1539      +14     

Impacted Files	Coverage Δ
lux/utils/debug_utils.py	26.31% <26.31%> (ø)
lux/__init__.py	100.00% <100.00%> (ø)

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[dorisjlee]

Thanks Cristian! Several suggested minor fixes on show_version, but otherwise looks good. I think show_version and some of the other functions in #451 can be called via a user-facing "debug" function. That could be a separate PR or part of #451. Once we have that, we should also add instructions in the troubleshooting guide on what the users would have to call to trigger the debug messages.

[dorisjlee]

Please edit the PR title so that it is formatted based on the commit guidelines (e.g., DOCS-#...: commit message)

[cgarciae]

Hey @dorisjlee! Sounds good, lux.debug could aggregate information from all these functions. Once this are merge that would be easy.

[cgarciae]

@dorisjlee added packages info from jupyter --version

[dorisjlee]

Looks good! Thanks @cgarciae!