CLI improvements

[gimenete]

• [ ] Base class for all commands that support --json.
• [ ] Better typing for run() methods.
• [x] Utility methods for prompts and skip interactivity if --no-input is used or the terminal is not a TTY.
  • [ ] https://www.npmjs.com/package/@npmcli/ci-detect
• [ ] Always return the full API response?
• [x] Utilities for parsing flags that have also defaults depending on the context: workspace, database, branch.
• [ ] Allow users to specify slug when creating a db.
• [ ] Add a verbose option to print things such as the config file being used.
• [ ] Document exit codes.
• [ ] Validate identifiers before sending them to the server?
• [ ] Support pnpm when installing the SDK in xata init
• [x] Check if there's an API_KEY already in the .env file when writing to it
• [ ] Support other paths for the .env file
• [ ] Offer a command to generate/update API Key in the .env file without having to run xata init
• [x] Add examples.
• [x] Use suggestions in errors.

[SferaDev]

• [x] Save database url in project config file
• [x] Instead of failing if no database url found, inquiry user with his available workspaces and databases. If user is in a project and has a project config file, inquiry question for saving it there.