feat: CLI/API/Webui: Trigger dags from more complex user input

[bagemt]

Ref: https://docs.github.com/en/actions/writing-workflows/workflow-syntax-for-github-actions#onworkflow_dispatchinputs

#454, #439 are to some extend prerequisites

#753 also related

• Webui: trigger dag requiring user input
• API: trigger dags from the same user inputs
• YAML: define input syntax
• CLI: inputs defined in input YAML file / Piped

[ghansham]

One of the other complex scenario can be that one dag generates some output which is sent via mail to user. User clicks on the link sent via email which triggers another dag 😀