Update Kotlin-MCP-Server with STDIO support, logging & CORS
### Summary
- Added support for STDIO transport mode (default behavior).
- Configured CORS and migrated SSE server to Ktor's Netty engine.
- Redirected logs to `./build/stdout.log` and updated log levels.
- New `TestEnvironment` setup for integration testing.
- Enhanced documentation with examples for server execution and MCP
Inspector usage.
- Introduced shadow JAR plugin for building runnable artifacts.
### Motivation and Context
Improves server versatility and developer experience by enabling STDIO
and refining setup.
## How Has This Been Tested?
Unit tests, tested locally (see README.md in sample)
**NB! sse plain configuration is not working at the moment**
## Breaking Changes
No
## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [ ] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [ ] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed
## Additional context
<!-- Add any other context, implementation notes, or design decisions
-->
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