CrateDB: Respect special `DEFAULT` keyword in `INSERT` statements

[amotl]

Issue description

CrateDB needs to support the DEFAULT special keyword, like PostgreSQL does.

Expected Behavior

CrateDB supports such an invocation of SQL statements.

CREATE TABLE t (a INTEGER DEFAULT 5);
INSERT INTO t VALUES (DEFAULT);

• See also: Support DEFAULT keyword in INSERT statements crate/crate#14575

Actual Behavior

CrateDB currently lacks corresponding PostgreSQL feature.

/cc @hlcianfagna

[amotl]

CrateDB 6.3 might resolve this, so we can make progress. Thank you!

• Support DEFAULT keyword in INSERT statements crate/crate#14575

[amotl]

On behalf of the example project to validate connectivity, this command now works well on CrateDB nightly:

INSERT INTO "user"("id",
                   "firstName",
                   "lastName",
                   "age")
VALUES (DEFAULT, $1, $2, $3)

In this spirit, when also using @hlcianfagna's GH-2, starting the TypeORM example application succeeds:

$ npm start
Express server has started on port 3000. Open http://localhost:3000/users to see results

Thank you for submitting crate/crate#19053 to resolve this, @DHRUV6029. 💯