Add Mechanism to construct from a string representation of JSON Schema

[gfs]

This pull request introduces enhancements to the RuleSchemaProvider class, allowing schema providers to be created directly from JSON schema content strings, and adds unit tests to verify this new functionality and its error handling. These changes improve the flexibility and testability of the schema validation logic. To allow for extensibility by devSkim which will have its own schema loaded as an embedded resource - not a file on disk.

[Copilot]

Pull Request Overview

Adds a factory method to build RuleSchemaProvider instances directly from a JSON schema string and introduces tests for this new initialization path and rule validation.

• Adds FromSchemaContent factory plus supporting private constructor and refactors existing loaders to use a shared LoadSchemaFromContent helper.
• Introduces tests for successful load, null/empty argument handling, and validation against a minimal custom schema.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
AppInspector.RulesEngine/Schema/RuleSchemaProvider.cs	Adds string-based factory method, private constructor, and shared schema content loader.
AppInspector.Tests/RuleProcessor/SchemaValidationTests.cs	Adds unit tests for new factory method and rule validation with a minimal schema.

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[Copilot]

Pull Request Overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

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