Explore options for new DB engines (MySQL, MSSQL and similar)

[infomiho]

Since Wasp uses Prisma as its abstraction layer for the database, it should be possible for us to expand our support for SQLite and PostgreSQL to more database engines.

We should take into account if our maintenance surface area will increase too much or not.

One caveat to note is: we already support some PostgreSQL specific features (PgBoss executor for jobs) and we should see how do we deal with these DB engine specific features.