fix(PGlite): improve type support

[sandros94]

Proposed in sandros94/nuxt-pglite#7, these changes improve typing for newly created PGlite instance that do have extensions added.

This also make sure that the PGlite instance is ready before executing any query (.create internally also awaits for .waitReady).

I've also changed the following default because in rare occasions PGlite forcefully tries to find params in an empty array, hanging without notice:

-async function query(sql: string, params: unknown[] = []) {
+async function query(sql: string, params: unknown[] = undefined) {

[sandros94]

The mention in the nuxt/ui issue was just my copy/paste not working correctly.

Got a new keyboard now 😬

[codecov]

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