[Pg[: Add pgEnumCreator function

[scinscinscin]

This function allows users to prefix their enums like they do with pgTableCreator.

It also implements a test to make sure that it creates the enum object properly with the correct name.

pg-core/columns/enum.ts

export function pgEnumCreator(customizeTableName: (name: string) => string): typeof pgEnum {
	// @ts-ignore
	return (_enumName: string, input: any) => {
		return pgEnum(customizeTableName(_enumName), input);
	};
}

The usecase for this function should be similar for usecases for pgTableCreator, which i use in projects so that I can have more than 1 project use the same database in Neon free tier.

Please let me know if there are things that can be improved. I am unsure if the test that I wrote is correct since each test is supposed to be an integration test, what I made is more of a unit test.