New package - Hashicorp Vault

[andrewkroh]

What does this PR do?

Create a new package to collect logs and metrics from Hashicorp Vault.
There are three data streams:

• audit - Audit logs from file or TCP socket.
• log - Operation log from file.
• metrics - Telemetry data from the /sys/metrics API.

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.
• If I'm introducing a new feature, I have modified the Kibana version constraint in my package's manifest.yml file to point to the latest Elastic stack release (e.g. ^7.13.0).

Author's Checklist

• Add dashboards
• Operational logs are almost never in a file. See if we can make journald input available in Agent.
• Add screenshots.

Reviewer Notes

• Review field names. hashicorp_vault as a prefix to most fields is quite long.
• Review package categories.
• Review ECS category for audit log.

Related issues

• Closes Hashicorp Vault #1158

Screenshots

[elasticmachine]

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Build stats

• Start Time: 2021-08-12T12:35:26.233+0000

• Duration: 15 min 7 sec

• Commit: 7ec1880

Test stats 🧪

Test	Results
Failed	0
Passed	17
Skipped	0
Total	17

Trends 🧪

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

[andrewkroh]

run tests