feat: add jsonb (fixes #317)

[gajus]

• changes sql.json to produce bindings with ::json type identifier
• adds new sql.jsonb method
• sql.json is now 'null':json (previously it was NULL)

If you desire the old sql.json NULL behavior, you will need to refactor code to:

const foo = /* maybe NULL */;

sql`
SELECT ${foo === null ? NULL : sql.json(foo)}
`

BREAKING CHANGE:

• previously sql.json did not specify ::json or ::jsonb. Now the appropriate type identifier is chosen based on whether you use sql.json or sql.jsonb. In future, this may be leveraged to achieve greater performance when using sql.jsonb.

[coveralls]

Coverage increased (+0.05%) to 88.835% when pulling 7e56c94 on gajus/add-jsonb into 2249e05 on master.

[thecodeboss]

Looks solid to me, thanks for tackling this. Tests look great too.

[gajus]

🎉 This PR is included in version 28.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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