GoogleProvider: add literal types

[dora-gt]

Description

Currently, in TypeScript, region and zone are expressed by string. This is not useful because we have to fill out the string on our own. Literal type helps here like:

type Region = 'asia-northeast1' | 'asia-northeast2' | .....;
readonly region?: Region;

Are you open to accept pull-requests for this? I'm keen to.

References

No response

Help Wanted

• I'm interested in contributing a fix myself

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