[5.x] Add js tag

[godismyjudge95]

A few times I have found the need to directly pass a variable for use in JS. Granted this could be done with the current {{ variable | to_json }} modifier, but I wanted an easier way.

This PR adds a {{ js }} tag for this convenience.

Example Data:

$us_states = [
    'AL' => 'Alabama',
    'AK' => 'Alaska',
];

Example Template:

{{ js:us_states }}

{{ js name="states" :from="us_states" }}

<script>
{{ js:us_states script="false" const="false" }}
</script>

Example Output:

<script>const us_states = {"AL":"Alabama","AK":"Alaska"};</script>

<script>const states = {"AL":"Alabama","AK":"Alaska"};</script>

<script>
let us_states = {"AL":"Alabama","AK":"Alaska"};
</script>

[jackmcdade]

I'm on the fence with this one. At the very least I don't think the name of the tag is the best fit because i can't reasonably guess as to what it would be doing. My first guess would be rendering a JS file of that name. I don't know that i'd have ever guess by looking at the template code that it was writing a script tag and converting a var to a js object. 🤔

Ultimately this is exactly the same as:

<script>const us_states = {{ us_states | to_json }}</script>

Right?

[jasonvarga]

We appreciate the PR but feel like it's a bit overkill and would probably be an "issue magnet" with people wanting to add params to tweak behavior in the future etc.

It's already super easy to output a script tag with JS. You can already do what you need to with the to_json modifier, and even Laravel's Js facade in Antlers.

<script>var app = {{$ Js::from($my_array) $}};</script>

Of course if this is really important to you, you can add that tag to your own projects or bundle it as an addon.

Thanks for understanding!