Add time and date support in SQL queries

[sanketsarang]

Add support for CURRENT_DATE, CURRENT_TIME and CURRENT_TIMESTAMP in SQL queries.

[Keerthana-Thiagaraj]

@sanketsarang can you briefly add a description. Thanks

[sanketsarang]

@Keerthana-Thiagaraj the database currently does not processes queries such as select * from datastore.AccessTokens where expiresAt < CURRENT_DATE. The problem is that the SQL parser currently does not handle processing conditions for CURRENT_DATE, CURRENT_TIME and CURRENT_TIMESTAMP. This needs to be added.

Check the SelectExecutor class