Add support for pretty printing json output

[mntlty]

When running the server on stdio, the JSON output can be hard to read for humans. It would be nice to have a flag that allows for pretty printing the output.

Current behavior:

GitHub MCP Server running on stdio
{"jsonrpc":"2.0","id":3,"params":{},"method":"tools/list"}
{"jsonrpc":"2.0","id":3,"result":{"tools":[{"description":"Add a comment to an existing issue","inputSchema":{"type":"object","properties":{"body":{"description":"Comment text","type":"string"},"issue_number":{"description":"Issue number to comment on","type":"number"},"owner":{"description":"Repository owner","type":"string"},"repo":{"description":"Repository name","type":"string"}},"required":["owner","repo","issue_number","body"]},"name":"add_issue_comment"},{"description":"Create a new branch in a GitHub repository","inputSchema":{"type":"object","properties":{"branch":{"description":"Name for new branch","type":"string"},"from_branch":{"description":"Source branch (defaults to repo default)","type":"string"},"owner":{"description":"Repository owner","type":"string"},"repo":{"description":"Repository name","type":"string"}},"required":["owner","repo","branch"]},"name":"create_branch"},{"description":"Create a new issue in a GitHub repository","inputSchema":{"type":"object","properties":{"assignees":{"description":"Usernames to assign to this issue","items":{"type":"string"},"type":"array"},"body":{"description":"Issue body content","type":"string"},"labels":{"description":"Labels to apply to this issue","items":{"type":"string"},"type":"array"},"milestone":{"description":"Milestone number","type":"number"},"owner":{"description":"Repository owner","type":"string"},"repo":{"description":"Repository name","type":"string"},"title":{"description":"Issue title","type":"string"}},"required":["owner","repo","title"]},"name":"create_issue"},{"description":"Create or update a single file in a GitHub repository","inputSchema":{"type":"object","properties":{"branch":{"description":"Branch to create/update the file in","type":"string"},"content":{"description":"Content of the file","type":"string"},"message":{"description":"Commit message","type":"string"},"owner":{"description":"Repository owner (username or 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Use this when a request include \"me\", \"my\"...","inputSchema":{"type":"object","properties":{"reason":{"description":"Optional: reason the session was created","type":"string"}}},"name":"get_me"},{"description":"Get details of a specific pull request","inputSchema":{"type":"object","properties":{"owner":{"description":"Repository owner","type":"string"},"pullNumber":{"description":"Pull request number","type":"number"},"repo":{"description":"Repository name","type":"string"}},"required":["owner","repo","pullNumber"]},"name":"get_pull_request"},{"description":"Get the review comments on a pull request","inputSchema":{"type":"object","properties":{"owner":{"description":"Repository owner","type":"string"},"pullNumber":{"description":"Pull request number","type":"number"},"repo":{"description":"Repository name","type":"string"}},"required":["owner","repo","pullNumber"]},"name":"get_pull_request_comments"},{"description":"Get the list of files changed in a pull request","inputSchema":{"type":"object","properties":{"owner":{"description":"Repository owner","type":"string"},"pullNumber":{"description":"Pull request number","type":"number"},"repo":{"description":"Repository name","type":"string"}},"required":["owner","repo","pullNumber"]},"name":"get_pull_request_files"},{"description":"Get the reviews on a pull request","inputSchema":{"type":"object","properties":{"owner":{"description":"Repository owner","type":"string"},"pullNumber":{"description":"Pull request number","type":"number"},"repo":{"description":"Repository name","type":"string"}},"required":["owner","repo","pullNumber"]},"name":"get_pull_request_reviews"},{"description":"Get the combined status of all status checks for a pull request","inputSchema":{"type":"object","properties":{"owner":{"description":"Repository owner","type":"string"},"pullNumber":{"description":"Pull request number","type":"number"},"repo":{"description":"Repository name","type":"string"}},"required":["owner","repo","pullNumber"]},"name":"get_pull_request_status"},{"description":"List code scanning alerts in a GitHub repository.","inputSchema":{"type":"object","properties":{"owner":{"description":"The owner of the repository.","type":"string"},"ref":{"description":"The Git reference for the results you want to list.","type":"string"},"repo":{"description":"The name of the repository.","type":"string"},"severity":{"description":"Only code scanning alerts with this severity will be returned. 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