Validation for data model for #switch section

[angelozerr]

See https://quarkus.io/guides/qute-reference#when_section

Given:

{#switch person.name}
  {#case 'John'} 
    Hey John!
  {#case 'Mary'}
    Hey Mary!
  {#case 123}
{/switch}

Here person.name is a String, but last #case (which i sequals to 123) is a number, we should higlight 123 as an error to say that it is an unexpeced type.

We should support too enum like

{#when machine.status}
  {#is ON}
    It's running. 
  {#is in OFF BROKEN}
    It's broken or OFF. 
  {#is in BAD_ENUM_VAUE}
{/when}

BAD_ENUM_VAUE must be higlighted as en error. Please note that #is can have several values (OFF BROKEN)