Add material/patternfly ui for function workflow

[mohitsuman]

create a custom webview to guide function workflow. Use patternfly for the forms and components creation.

Patternfly: https://www.patternfly.org/v4/components/form/

[jeffmaury]

vscode-wizard is the recommended way to built forms in VSCode. It has been used by several of our plugins (Kafka, RSP, Tekton). It should be the way to go unless there are good reasons to deviate