fix(hogql): Support parsing dw properties with nested values

[danielbachhuber]

Changes

Updates property_to_expr() to handle data warehouse properties with nested values, e.g.:

 prepared_count_query.properties = [
    DataWarehousePropertyFilter(
        key=f"{column_name}.event",
        value="$feature_flag_called",
        operator=PropertyOperator.EXACT,
        type="data_warehouse",
    ),
    DataWarehousePropertyFilter(
        key=f"{column_name}.properties.{self.breakdown_key}",
        value=self.variants,
        operator=PropertyOperator.EXACT,
        type="data_warehouse",
    ),
]

Without the patch, the properties evaluate to:

sql(and(equals(events.event, '$feature_flag_called'), or(equals(`$feature/dw-trends-nov-14-v2`, 'control'), equals(`$feature/dw-trends-nov-14-v2`, 'test'))))

With the patch, the properties evaluate to:

sql(and(equals(events.event, '$feature_flag_called'), or(equals(events.properties.`$feature/dw-trends-nov-14-v2`, 'control'), equals(events.properties.`$feature/dw-trends-nov-14-v2`, 'test'))))

From https://github.com/PostHog/posthog/pull/26301

How did you test this code?

Tests should pass

Also verified that https://github.com/PostHog/posthog/pull/26301 works as expected with this patch