Added tag filtering and speedup

[edurdevic]

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Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (dfc9c3f) 92.90% compared to head (511f7c9) 92.40%.

Files	Patch %	Lines
discoverx/explorer.py	50.00%	4 Missing :warning:
discoverx/table_info.py	87.50%	1 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
- Coverage   92.90%   92.40%   -0.51%     
==========================================
  Files          11       11              
  Lines         874      895      +21     
  Branches      151      158       +7     
==========================================
+ Hits          812      827      +15     
- Misses         34       39       +5     
- Partials       28       29       +1     

Flag	Coverage Δ
unittests	92.40% <76.00%> (-0.51%)	:arrow_down:

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[zaxier]

This feature would assist my use case where a customer wants to be able to arbitrarily group tables into categories (as lists) and apply maintenance jobs based on the category. Different categories will exist side by side each other in any schema and therefore pattern based matching (without restrictive table naming conventions) won't work. A solution would be to use table tags allowing us to use patterns + table tags and keep the convenience and functionality of discoverx to operate over lists of tables.