[google_workspace] Allow to set credentials directly in the config.

[marc-gr]

What does this PR do?

Adds an option to set up credentials directly in the UI instead of using a file.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Related issues

• Depends on [filebeat][httpjson] Add google.jwt_json option to httpjson input beats#31750
• Closes [google_workspace] Add config option alternatives that don't depend on reading local files #2834

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

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Build stats

• Start Time: 2022-06-08T09:29:08.458+0000

• Duration: 19 min 5 sec

Test stats 🧪

Test	Results
Failed	0
Passed	45
Skipped	0
Total	45

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[marc-gr]

/test

[marc-gr]

/test

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (6/6)	💚
Files	100.0% (6/6)	💚 3.497
Classes	100.0% (6/6)	💚 3.497
Methods	100.0% (80/80)	💚 10.61
Lines	96.727% (1596/1650)	👍 5.936
Conditionals	100.0% (0/0)	💚

[adriansr]

LGTM