Add MCP server logs to --cli mode

[yoazmenda]

When using the MCP Inspector in CLI mode, I couldn't find an easy way to see the MCP server logs (unlike in the web UI where they appear in the "Error output from MCP server" pane). Seeing the logs in the terminal or in a log file when launching mcp commands would be super useful for debuggin/troubleshooting and automation

Maybe we could add a flag to output the server logs to in CLI mode to the terminal or a log file, similar to how they're shown in the web UI

npx @modelcontextprotocol/inspector --cli --config config.json --server myserver  --server-logs=true --method tools/list

or with a log file since the terminal output is already populated by mcp commands output

npx @modelcontextprotocol/inspector --cli --config config.json --server myserver  --server-logs=true --server-logs-file=./my-mcp-logs.txt --method tools/list