CQL2: Improve date handling

[cportele]

Describe the Feature Request

For predicates with properties of type DATE, use date in literals, not timestamps. Currently the type of a property is not known when visiting/processing a CQL2 expression, so for an instant it could be either a date or timestamp. Currently the default assumption is timestamps, which can lead to unexpected results (the date is cast to the first timestamp of the day in UTC).

Describe the Use Case

Avoid casts for dates to instants.

Describe Preferred Solution

This would require that type information of queryables is available when processing CQL2 expressions.

Additional Information

Source: #599