Set up cortex config json schema generator

[CharlieTLe]

What this PR does:
Adds a JSON schema for our cortex configuration so that we could get validation and auto completion in editors that support the yaml-language-server. This will make it easier to understand our configuration since the description of what each field is about will also appear as a popover in the ide when the field is hovered over by the cursor.

Changes to the schema are automated just like how the docs are generated, making it easy to maintain.

Which issue(s) this PR fixes:
Fixes #

Checklist

• Tests updated
• Documentation added
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]

[Copilot]

Pull Request Overview

This PR adds JSON schema generation functionality to the existing documentation generator tool, allowing the Cortex configuration to be exported as a JSON schema in addition to the existing markdown documentation.

• Adds a new JSONSchemaWriter that converts parsed configuration blocks into JSON schema format
• Extends the main doc-generator with command-line flags for JSON schema generation (-json-schema and -output)
• Integrates JSON schema generation into the build process via Makefile

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 4 comments.

File	Description
tools/doc-generator/main.go	Adds JSON schema generation mode with CLI flags and routing logic
tools/doc-generator/json_schema_writer.go	Implements complete JSON schema generation functionality with type mapping and structure handling
Makefile	Adds JSON schema generation to the documentation build target