Enable a mode where a MCP agent can connect

[theogf]

I think it would be interesting to connect TestPicker with AI agents to provide a faster feedback loop between using an agent and making minimal tests.
See e.g. https://github.com/hexaeder/MCPRepl.jl

[theogf]

Started a different repository instead to not pollute this one for people wanting to stay fully AI free :)

See https://github.com/theogf/TestPickerMCPServer.jl