feat: add test configuration patterns and service provider overloads documentation

[thomhurst]

This accompanies PR BrighterCommand/Brighter#3952 and should not be merged until that PR is merged.

This pull request adds comprehensive documentation for advanced configuration patterns using service provider overloads and the Microsoft Options pattern in Brighter. The updates explain how to leverage deferred service resolution and test-specific configuration for improved flexibility and parallel test execution, both in general Brighter configuration and when using in-memory options for testing.

Configuration Patterns and Testability Enhancements:

• Added a new section in BrighterBasicConfiguration.md documenting the use of Func<IServiceProvider, T> overloads for AddBrighter, AddProducers, and AddConsumers, enabling deferred resolution and runtime access to services from the DI container.
• Provided examples and explanations for integrating Brighter with the Microsoft Options pattern, including Configure<T> and PostConfigure<T> for environment-specific and test-specific overrides.
• Documented best practices for parallel test execution, showing how isolated service providers and post-configuration enable tests to run concurrently without static state conflicts. [1] [2]

In-Memory Testing Guidance:

• Added a "Test Configuration Patterns" section to InMemoryOptions.md, with code samples illustrating how to use service provider overloads and the Options pattern for isolated, parallelizable test setups.
• Linked to relevant sections in BrighterBasicConfiguration.md for further reading on advanced configuration and test patterns.

[Copilot]

Pull request overview

This pull request adds comprehensive documentation for advanced configuration patterns in Brighter, focusing on service provider overloads and the Microsoft Options pattern. These features enable deferred service resolution, test-specific configuration, and improved parallel test execution capabilities.

Key Changes:

• Documents Func<IServiceProvider, T> overloads for AddBrighter, AddProducers, and AddConsumers to enable runtime service resolution
• Explains integration with Microsoft Options pattern using Configure<T> and PostConfigure<T> for environment-specific and test-specific configuration overrides
• Provides practical examples showing how to achieve isolated, parallelizable test configurations without static state conflicts

Reviewed changes

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

File	Description
contents/BrighterBasicConfiguration.md	Added three new sections documenting service provider function overloads, Options pattern integration, and parallel test execution patterns with comprehensive code examples
contents/InMemoryOptions.md	Added "Test Configuration Patterns" section with examples of using PostConfigure for test overrides and cross-references to the detailed configuration documentation

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