amazon-aurora / babelfish_extensions / 15900419209

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Support empty string handling for date and time datatypes (#3807)


Add TSQL-compatible handling of empty string ('') for date and time types, defaulting to '1900-01-01' for date and time, similar to datetime, datetime2, datetimeoffset, smalldatetime.

Changes:
1. Add helper functions to initialize the default date and time variables
   and to check for strings with whitespaces.
2. Modify varchar2date() and varchar2time() to handle empty/whitespace
   casts from varchar types to date and time types.
3. Update tsql_coerce_string_literal_hook to handle empty/whitespace
   casts from string literals to date and time datatypes.
4. Default empty/whitespace strings to '1900-01-01' for date and
   '00:00:00.0000000' for time.
5. Updated existing date-time related test cases. Added more tests cases
   for wider test coverage.

Task: BABEL-3433
Signed-off-by: Manisha Deshpande <mmdeshp@amazon.com>

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