Cherry-pick #20414 to 7.x: [Filebeat][New Module] Zoom webhook module

[adriansr]

Cherry-pick of PR #20414 to 7.x branch. Original message:

What does this PR do?

This PR creates a module and fileset for Zoom webhooks, allowing filebeat to ingest webhooks initiated from Zoom and map it to ECS.

Why is it important?

Adds a new supported product to Filebeat.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Author's Checklist

• Need to check if the size of fields.yml is still okay
• Needs a second iteration to look over the different mappings and compare them to https://marketplace.zoom.us/docs/api-reference/webhook-reference/
• Need to add test data
• Need to add support for Zoom secret (in header). Will be done in a separate PR: [Filebeat][http_endpoint input] Adds support for custom auth header names and secret #20435

[elasticmachine]

Pinging @elastic/siem (Team:SIEM)

[elasticmachine]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request #21073 updated]

• Start Time: 2020-09-14T15:39:03.199+0000

• Duration: 56 min 24 sec

Test stats 🧪

Test	Results
Failed	0
Passed	5567
Skipped	833
Total	6400

[marc-gr]

Seems like mage fmt update needs to be ran. Error: some files are not up-to-date. Run 'mage fmt update' then review and commit the changes. Modified: [x-pack/filebeat/modules.d/zoom.yml.disabled]