feat(tools): create an allow list for MCP tools

[BrunoKrugel]

Currently, we only have an option for a deny list (disabled_tools) in MCP Tools, however, for MCP with a lot of tools, it is really hard to disable all the tools and keep it clean.

For example, the Jira MCP has 73 tools:

This PR introduces an allow list enabled_tools, so we can enable only the tools that we want:

    "mcp-atlassian": {
      "type": "stdio",
      "command": "uvx",
      "enabled_tools": ["jira_get_issue", "jira_search"],
      "args": ["mcp-atlassian"],
    }

• I have read CONTRIBUTING.md.
• I have created a discussion that was approved by a maintainer (for new features).

Closes #2815

[meowgorithm]

This is a good one. I know the pain here myself. What happens when you have both enabled_tools and disabled_tools set?

[BrunoKrugel]

This is a good one. I know the pain here myself. What happens when you have both enabled_tools and disabled_tools set?

They run sequentially, and the enabled_tools runs first, if we configure:

    "mcp-atlassian": {
      "type": "stdio",
      "command": "uvx",
      "enabled_tools": ["jira_get_issue", "jira_search"],
      "disabled_tools": ["jira_get_issue"],
      "args": ["mcp-atlassian"],
    }

Only the jira_search will be enabled, I created this test for this scenario.