Fixed Config persistence

[LanderOtto]

This commit fixes the ScheduleStep persistence, particularly the BindingFilter object.
The filters attribute in BindingFilter was not being saved correctly in the database.
A new class extends the Config, called FilterConfig, and a new table was added to the database.

The extention of PersistableEntity was moved from Config to its superclasses only where needed, i.e. DeploymentConfig and FilterConfig.

[codecov-commenter]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (980a511) 65.89% compared to head (b973338) 66.00%.

Files	Patch %	Lines
streamflow/persistence/sqlite.py	73.33%	4 Missing ⚠️
streamflow/deployment/utils.py	25.00%	3 Missing ⚠️
streamflow/config/config.py	60.00%	0 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
+ Coverage   65.89%   66.00%   +0.10%     
==========================================
  Files          82       82              
  Lines       10151    10180      +29     
  Branches     2398     2409      +11     
==========================================
+ Hits         6689     6719      +30     
- Misses       3029     3030       +1     
+ Partials      433      431       -2     

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