extract mcp-core

[sdelamo]

This change extracts classes previously in mcp to mcp-core; a new module which does not depend on mcp-json-jackon2.

mcp module is now an umbrella module that brings mcp-json-jackon2 and mcp-core

Motivation and Context

The motivation is to have a mcp-core module which is free of Jackson dependencies.

How Has This Been Tested?

This PR only relocated sources. I have run p ./mvnw clean install -DskipTests and ./mvnw test.

Breaking Changes

mcp dependency still contains mcp-core and mcp-json-jackson2. However, the classes will be in a different JAR. Thus, this can be considered a breaking change.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• Build/Publishing

Checklist

• I have read the MCP Documentation
• 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

[sdelamo]

@tzolov, could you check the different pom.xml in mcp-json, mcp-json-jackson2, mcp, and mcp-core and ensure the configuration of the bnd-maven-plugin and maven-jar-plugin is correct?

I don't have experience with the publication settings of the project, and I fear I have misconfigured those plugins.

[tzolov]

Thanks @sdelamo!
The changes look good and align with our previous discussion. The Maven plugins also look good to me.