Feature/68 publication filters

[bart-maykin]

Fixes #68

Changes

Added 4 queryparams for publication endpoint:

• search (which is both title fields combined)
• registratie_datum (gte and lte)
• information_categories (comma seperated)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Files with missing lines	Coverage Δ
src/woo_publications/publications/api/filters.py	100.00% <100.00%> (ø)