unify query and command handling under requestHandling

[osoykan]

No description provided.

[Copilot]

Pull Request Overview

This PR overhauls the framework to merge separate query/command types into a unified Request/RequestHandler API. It updates all test suites, dependency‐injection modules, core classes, and documentation to replace Query/Command artifacts with the new Request design.

• Replace every *Command* and *Query* handler and type with Request equivalents in tests and starters
• Remove old CommandHandler/QueryHandler/CommandProvider/QueryProvider in core and wire up a single RequestProvider
• Refresh KDoc, README, and migration guide to reflect the unified request‐based model

Reviewed Changes

Copilot reviewed 29 out of 29 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
projects/*/src/test/kotlin/com/trendyol/kediatr/**/MediatorTests.kt	Swapped out TestCommandHandler* and TestQueryHandler for TestRequestHandler*
projects/kediatr-quarkus-starter/.../MediatorTests.kt	Updated producer methods to return TestRequestHandler* instead of old handlers
projects/kediatr-koin-starter/.../MediatorTests.kt	Adjusted Koin single bindings from CommandHandler/QueryHandler to RequestHandler
projects/kediatr-core/src/testFixtures/.../models.kt	Renamed all test fixtures from Command/Query to Request types
projects/kediatr-core/src/testFixtures/.../MediatorUseCases.kt	Updated test assertions to expect TestRequestHandler* naming
projects/kediatr-core/src/test/kotlin/com/trendyol/kediatr/MediatorTests.kt	Updated core tests to use unified RequestHandler handlers
projects/kediatr-core/src/main/kotlin/com/trendyol/kediatr/*.kt (multiple files)	Refactored core API: removed CommandHandler/QueryHandler and merged into RequestHandler, updated registry, providers, MediatorImpl, etc.
README.md	Minor example update of PingCommand to Request.Unit
MIGRATION_GUIDE.md	Expanded and reformatted migration instructions to cover new API

Comments suppressed due to low confidence (3)

README.md:19

• The example still references the old Query interface. Update to Request<String> (or add a typealias Query<T> = Request<T> if you intend to keep backward compatibility).

class PingQuery : Query<String> // or

README.md:21

• This example shows the old CommandHandler API. It should be updated to RequestHandler.Unit<PingCommand> to match the new unified handler interface.

class PingCommandHandler : CommandHandler.Unit<PingCommand> {

MIGRATION_GUIDE.md:18

• [nitpick] The alias RequestHandlerDelegate wasn’t removed—its signature was tightened with a : Message constraint, but the type alias remains. Please remove or clarify this bullet.

- **Removed**: `RequestHandlerDelegate<TRequest, TResponse>` type (replaced with same name but different signature)