Provide global output flag for setting output format in CLI commands

[hackerwins]

Description:

Recently, we added the output flag to the version command in the CLI to specify the output format ('', yaml, json). This format allows users to configure their system workflows when invoking the CLI, making it easier for the system to recognize the data.

https://github.com/yorkie-team/yorkie/pull/938

Currently, the output flag is specific to the version command, but it can be expanded to serve the purpose of specifying the output format for all CLI commands.

Why:

To provide a consistent and convenient way for users to set the output format for all CLI commands, enhancing the usability of the CLI tool.