feat(api) adds templating to the csv formated out using go's text/template

[eblechschmidt]

Implements feature proposed in #22:

• Adds default templates for all commands
• Adds template flag to specify file name for templating csv output
• Adds missing csv format to document command
• Bumps all version of go.mod file to the newes version

[eblechschmidt]

This is my first ever contribution/pull request so please help me if I missed something.

[jsattler]

@eblechschmidt thanks for your contribution! I will review your contribution within the next days and provide feedback ☺️