Experimental changes to allow relational-data-sink implementation to work with different database backends

[mfang90739]

Added test code to scope out the work needed to support the following variants:

• SQLite
• MariaDB
• MySQL
• Microsoft SQL (MSSQL)

Testing has been done on a MacBook Pro M3 system for the first three; the corresponding log file is attached for reference. The code for MSSQL remains to be tested, so consider it as a place holder for now.

sqlite.log mariadb.log mysql.log

[mfang90739]

Just pushed back the change for MS-SQL. The testing result is captured in mssql.log

[CLAassistant]

All committers have signed the CLA.