feat: more flexible filter specification to allow overriding and appending to filters

[alexander-held]

This implements a new approach for filter specification outlined in #307 (comment).

Breaking changes:

• the Filter option in configs is replaced by Filters, which takes a dictionary instead of a string
• the dictionary for Filters needs a user-defined name (Name property) and the filter itself (a string, as Filter)

to-do:

• update tests
• documentation for new filter approach
• decide whether to pass through general config info in every function call in apply_to_all_templates, or whether to wrap required info like currently done with ntuple and histogram paths (if not, that should probably be refactored in a second step)
• consider this also for weights

resolves #307

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (729a5d8) compared to base (6281501).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #310   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        23           
  Lines         2023      2032    +9     
  Branches       331       335    +4     
=========================================
+ Hits          2023      2032    +9     

Impacted Files	Coverage Δ
src/cabinetry/route.py	100.00% <ø> (ø)
src/cabinetry/configuration.py	100.00% <100.00%> (ø)
src/cabinetry/templates/__init__.py	100.00% <100.00%> (ø)
src/cabinetry/templates/builder.py	100.00% <100.00%> (ø)

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