Feat: Add initial Gist tools

[xodene]

Feature: Initial tools for managing Gists.

• ListGists

list_gists

• Description: List gists for a user.
• Parameters:
  • username (string, optional): GitHub username (omit for authenticated user's gists).
  • since (string, optional): Only gists updated after this time (ISO 8601 timestamp).
  • page (number, optional): Page number.
  • perPage (number, optional): Results per page.

• CreateGist
  Description: Create a new gist.
• Parameters:
  • description (string, optional): Description of the gist.
  • filename (string, required): Filename for gist file
  • content (string, required): Content for gist file
  • public (boolean, optional): Whether the gist is public (default: false).

• UpdateGist

update_gist

• Description: Update an existing gist.
• Parameters:
  • gist_id (string, required): ID of the gist to update.
  • description (string, optional): Updated description of the gist.
  • filename (string, required): Filename to update or create.
  • content (string, required): Content for the file.

The screenshot below demostrates editing an existing Gist with the new content from the opened file

Closes: #183

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