Get data filter review

• bulk filter parsing done using a regex instead of manual parsing. It also allows to filter if the column name contains ':' by enclosing it in double quotation marks (e.g. "Sensor:0":lt:1 "Sensor:180":gt:42). This replace the function parse_filter.

• bulk filter regex defined at query param declaration.

• bulk filter operators defined only once as an enum instead of multiple times (here, here and here).

• explicit class instead of raw dict.

• Code from get_parsed_filters moved inside BulkReadFilters

nit: I removed the URL link to https://www.moesif.com/blog/technical/api-design/REST-API-Design-Filtering-Sorting-and-Pagination/#rhs-colon/ from param filter description because it does provide much insights moreover it's quite misleading since the syntax used in wdms is different: price=gte:10vs price:gte:10