Enhancement: Ability to make calls to a non-existent/disabled tools, or send non-matching schema arguments

[KKonstantinov]

Related to https://github.com/modelcontextprotocol/typescript-sdk/pull/1044, it would be useful if Inspector has a test or debug mode, which unlocks the following:

• Makes React not lock you to input types (e.g. if inputSchema defines a number, I can now write anything in the field and send it to the server) - This will allow for easily testing the error returned by the MCP server if there is a schema validation error
• Allows you to send a custom JSON-RPC payload to a non-existent/disabled tool, by allowing the end user to write the tool name themselves - in order to test the server behavior for non-existent/disabled tools