POC: Configurable Event Definition Visibility Enforcement for Alerts

[kingzacko1]

Description

Adds Enforce Event Definitions permissions to Events Configuration to optionally enforce event definition visibility when performing alerts searches.

Additional query logic is only added if the config option is enabled and the searching user does not have eventdefinitions:read permission. Requires using DBEventDefinitionService.findPermittedIds which does introduce O(N) iteration over the entire event_definitions collection, as well as a new OR query on the EventsSearch itself.
/prd Graylog2/graylog-plugin-enterprise#14611

Motivation and Context

proposed solution to Graylog2/graylog-plugin-enterprise#14355

How Has This Been Tested?

minimal validation in a dev environment ensuring sharing of event definitions directly, by team, and by collection is supported. Will need to add IT tests and test thoroughly if we want to move forward with this feature.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have requested a documentation update.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.