feat: converts the filters passed before executing the count operation

[BeeMargarida]

Support for parsing and converting the kwargs of count function, similar to the logic present in find.
This is required if we want to use the same filtering logic for counting as the one we have for listing.

[BeeMargarida]

@joamag Tagging you
This is required for this issue

[coveralls]

Coverage increased (+0.2%) to 64.603% when pulling febb200 on BeeMargarida:ms/convert_kwargs_count into 96819cd on hivesolutions:master.

[coveralls]

Coverage decreased (-0.6%) to 63.819% when pulling 1665ff5 on BeeMargarida:ms/convert_kwargs_count into 96819cd on hivesolutions:master.