Support prepared statements SQL statements

[fulghum]

Client tooling can already execute prepared statements through commands over MySQL's wire protocol, but we don't yet support creating, executing, and deallocating prepared statements directly through SQL commands. This is a handy feature for debugging and should be easy to wire up to the existing prepared statement support.

Add support for PREPARE, EXECUTE, and DEALLOCATE PREPARE:
https://dev.mysql.com/doc/refman/8.0/en/sql-prepared-statements.html#prepared-statement-types

[jycor]

fix is merged to gms, and will eventually merge to dolt main