feat(locale): en_AU state postcode definitions

[ProxiBlue]

Add in en_AU localisation for state postcodes

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[matthewmayer]

This is not the correct location. Needs to be in a seperate file. Check the en-us locale for an example.

[ProxiBlue]

Thanks, I completely missed that. In the US example, teh default postcode.ts file does not exist.
Is that correct? I must remove the file, or leave it as a default?

I figure remove, as AU cannot have a random 'default' value. states must match postcodes else form validation may fail.

[ProxiBlue]

ah, ok, no I have more issues:

[Unhandled error: src/locales/en_AU/location/index.ts#L17](https://github.com/faker-js/faker/pull/3219/files#annotation_27826361785)
TypeCheckError: Type '{ NSW string[]; ACT string[]; VIC string[]; QLD string[]; SA string[]; WA string[]; TAS string[]; NT string[]; }' is not assignable to type 'string | string[] | null | undefined'.
 ❯ src/locales/en_AU/location/index.ts:17:3

I will pull PR for now, and get it properly sorted. Just a bit busy. thought it was a quick drop a file in PR, sine I was busy with tests in this section.

Will get back to this later, more urgent work to get done