FEATURE: Add support for google.auth.credentials.AnonymousCredentials

[shrivastava-ankur]

resolves #
#1377

Problem

Currently there is no way to run dbt-bigquery locally using big-query emulator.

Solution

Support google.auth.credentials.AnonymousCredentials for bigquery enabling to unit test models in isolation locally.

• introduced new connection method anonymous to use of AnonymousCredentials
• Ability client_options (specifically api_endpoint to connect to local instance) to client instantiation

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX

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[nightscape]

This is exactly what I've been searching for. Any chance of getting this merged @MichelleArk @colin-rogers-dbt @mikealfare ?

[nightscape]

Hmm, looks like quite a bit of code has been moved since this PR.
I'd be happy to do a rebase and move the logic to the appropriate new places, but then it would be great if this could be merged before it gets conflicted again.

[jtcohen6]

@nightscape See the related conversation in a similar PR:

• Allow Bigquery Emulator settings to be set #1017 (comment)

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