camel_and_title_to_snake handles snake string with numbers

[rwedge]

Fixes #2195

[codecov]

Codecov Report

Merging #2220 (c79d8dd) into main (d42ecf1) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2220   +/-   ##
=======================================
  Coverage   99.29%   99.29%           
=======================================
  Files         146      146           
  Lines       17577    17579    +2     
=======================================
+ Hits        17453    17455    +2     
  Misses        124      124           

Impacted Files	Coverage Δ
featuretools/synthesis/deep_feature_synthesis.py	99.07% <ø> (ø)
...ols/tests/synthesis/test_deep_feature_synthesis.py	99.34% <ø> (ø)
featuretools/tests/utils_tests/test_gen_utils.py	100.00% <100.00%> (ø)
featuretools/utils/gen_utils.py	100.00% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[dvreed77]

lgtm!