Provide ReplaySearchContext for replayed search augmentations.

[dennisoelkers]

Description

Motivation and Context

This PR is doing two things to improve embedding searches:

• Provide a ReplaySearch component to simplify/consolidate the common pattern of embedding a replayed search for events/event definitions
• Provide and use a ReplaySearchContext instead of parsing the URL to make replayed search augmentations (e.g. showing event metadata on top) more modular

/nocl Internal Refactoring.
/prd Graylog2/graylog-plugin-enterprise#9482

How Has This Been Tested?

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 updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.