parse mcp tool json

[burmudar]

Define structures to parse the mcp tool json

• define general Schema which can be used for Input and Out schema definitions
• define SchemaValue interface to unitfy types under one umbrella
• specilzied schema types: SchemaObject, SchemaArray, SchemaPrimitve
• special handling for when items: true

Test plan

Added testcase and parsed the dumped json

[burmudar]

This change is part of the following stack:

• mcp: add script to dump mcp tool list #1211
  • parse mcp tool json #1212 ◀
    • add mcp list-tools to list available tool calls #1213
      • change name to RawName and have method for Name() that is normalized #1214
        • build flagset from input schema to parse args #1215
          • make json rpc 2.0 call based on cli args #1216

_{Change managed by git-spice.}

[burmudar]

temporarily ignored