Add support for allowlist in filters

[frenck]

Proposed Changes

This PR adds support for managing allowlists filters in AdGuard Home.

Additional, this is a bugfix; as currently the filter API calls will fail without the whitelist parameter.

Downstream issue: home-assistant/core#45296

[codecov]

Codecov Report

Merging #259 (0f01355) into main (03055dd) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #259   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          280       283    +3     
  Branches        17        18    +1     
=========================================
+ Hits           280       283    +3     

Impacted Files	Coverage Δ
src/adguardhome/filtering.py	100.00% <100.00%> (ø)

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