feat: BI-6156 add dt postprocessing to dashsql

[chl0rum]

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[Copilot]

Pull request overview

This PR implements datetime postprocessing for DashSQL queries, standardizing datetime output to ISO 8601 format (YYYY-MM-DDTHH:MM:SS) across different database connectors.

Changes:

• Added type annotations and removed a type-ignore comment in the query processing postprocessors module
• Updated DashSQL datetime formatting from space-separated to ISO 8601 T-separated format in test expectations
• Implemented type-aware postprocessing in DashSQL resource handler with error handling for datetime and array types

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
lib/dl_query_processing/dl_query_processing/postprocessing/postprocessors/all.py	Added type hints to TYPE_PROCESSORS dictionary and removed type-ignore comment
lib/dl_connector_trino/dl_connector_trino_tests/db/api/test_dashsql.py	Updated expected datetime format in test assertion from space-separated to ISO 8601 format
lib/dl_connector_clickhouse/dl_connector_clickhouse_tests/db/api/test_dashsql.py	Updated expected datetime formats in test assertions to ISO 8601 format
lib/dl_api_lib/dl_api_lib_tests/db/data_api/test_dashsql.py	Added comprehensive tests for datetime and array postprocessing with ISO 8601 validation
lib/dl_api_lib/dl_api_lib/app/data_api/resources/dashsql.py	Implemented type-aware postprocessing logic with datetime and array handling

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