mysql_info - add table count to the databases returned values

[laurent-indermuehle]

SUMMARY

This PR adds the count of tables for each database to the returned values of the mysql_info plugin.
As for size, it is possible to exclude this new field using the db_table_count filter.

In case the schema has no tables, the count is returned as 0.

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

mysql_info

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.10%. Comparing base (28bf709) to head (d42c0ce).
Report is 7 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #691       +/-   ##
===========================================
+ Coverage   25.74%   77.10%   +51.35%     
===========================================
  Files          32       20       -12     
  Lines        2808     2660      -148     
  Branches      704      676       -28     
===========================================
+ Hits          723     2051     +1328     
+ Misses       2044      413     -1631     
- Partials       41      196      +155     

Flag	Coverage Δ
integration	76.46% <100.00%> (?)
sanity	?
units	?

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[Andersson007]

@laurent-indermuehle thanks for the contribution!