FAST HTML allow passing primitives in template events

[janechu]

Description

The event handler syntax allows for passing the event ($e), and the context ($c). Given this we may also want to pass primitives booleans/strings/numbers. TBD.

This is pending some real world use cases but could look something like this:

<template>
    <button @click="{handleClick('add')}">Add</button>
    <button @click="{handleClick('delete')}">Delete</button>
</template>