CROSSLINK-210 Add date time field support

[JanisSaldabols]

No description provided.

[Copilot]

Pull request overview

Adds PostgreSQL date/datetime term parsing and query generation to the pgcql package, with accompanying unit and integration tests to validate SQL generation and execution.

Changes:

• Introduces a new FieldDateTime field type (NewFieldDate, WithOnlyDate) to generate SQL predicates and bind time.Time arguments.
• Extends parsing tests to cover date-only, datetime, and RFC3339-with-timezone inputs.
• Extends pgx integration tests to exercise date and timestamp columns and related CQL queries.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
pgcql/pg_field_datetime.go	Adds the new date/datetime Field implementation and parsing logic.
pgcql/pgcql_test.go	Adds unit tests asserting SQL and bound args for date/datetime parsing.
pgcql/pgx_test.go	Adds integration coverage for date/timestamp columns and comparisons.

Comments suppressed due to low confidence (2)

pgcql/pg_field_datetime.go:42

• The local variable name number holds a time.Time value from parseTerm, which is misleading and makes the code harder to follow. Rename it to something time-related (e.g., ts, dt, parsedTime) to match its actual type and intent.

	number, err := f.parseTerm(sc.Term)
	if err != nil {

pgcql/pg_field_datetime.go:20

• NewFieldDate() constructs a type that (by default) accepts date and datetime inputs; the name suggests a date-only field. Consider renaming this constructor to something like NewFieldDateTime() (and optionally adding a dedicated NewFieldDate() that sets WithOnlyDate()), to avoid confusing API consumers and make the default behavior explicit.

func NewFieldDate() *FieldDateTime {
	return &FieldDateTime{}
}

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[adamdickmeiss]

Looks good.

Perhaps allowing for only year to be given.

Also perhaps make support for date range with a 'within' operator.