Vectorize fuzzy_row_match

[Scienfitz]

• use vectorized operations instead of the for loop
• fixed column validations
• I tested that the result of the new version is always exactly equal to the old version
• added some basic pytests for the utility
• related to Question: Is it possible to utilize multiple cores when training (adding measurements)? #344

Here a resulting test looking at the speedup:

• speedup for the most realistic cases (left_df large versus right_df) approaches 4x from above
• for less relevant cases (left_df and right_df comparable in size or overall very small) the speedup can even be 40x

[AdrianSosic]

Hi @Scienfitz. Thx, this is great, finally some improvement to one of our legacy code parts 👍🏼 Overall, the logic is solid and the PR in good shape. There are a couple of issue to be fixed, though

[CLAassistant]

All committers have signed the CLA.

[AdrianSosic]

Thx again, I think looks very good now