Add osquery package

[marc-gr]

What does this PR do?

Adds osquery package

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all datasets collect metrics or logs.

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

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• Build Cause: Branch indexing

• Start Time: 2020-12-15T01:44:15.823+0000

• Duration: 31 min 31 sec

Test stats 🧪

Test	Results
Failed	0
Passed	145
Skipped	0
Total	145

[andrewkroh]

Given that #273 will eventually be merged and will provide a more integrated experience (I think it actually runs osquery for you and let's you run queries) maybe we should not migrate this Filebeat module over to here. @jamiehynds @bradenlpreston?

[bradenlpreston]

@andrewkroh - They are 2 different use cases to start. We are building a way to centrally manage and collect data from osquery. However, I don't think we want to remove the use case for when a user already has osquery deployed and managed, but they still want to send data to elastic. Would be great to cover both use cases.