CodeAction to create user tag file

Given this Qute template:

{#user price foo=value}
    ABCD
{/user}

In Qute it's an user tag, it means that src/main/resources/templates/tags/user.html shoudl exists. If it doesn't exists, it should be nice to provide a code action on #user:

• which creates src/main/resources/templates/tags/user.html
• with the following content

{it}
{foo}
{nested-content}

• {it} --> comes from price (a parameter without name)
• {foo} --> comes from foo=value (a parameter with a name)
• {nested-content} --> comes from ABCD a content inside the #user

Start with the requested Qute user-tag example and the target path src/main/resources/templates/tags/user.html. Trace how code actions are handled for the #user tag, then verify that the generated file contains {it}, named parameters such as {foo}, and {nested-content} from the tag body.