New AttributeCompiler and some new helper functions

[JohnathonKoster]

New AttributeCompiler

The AttributeCompiler is a new compiler service that can be used to compile attributes/parameters on a parsed ComponentNode. The AttributeCompiler implementation will use the core Laravel compiler for content that contains interpolated values.

Usage:

<?php

use Stillat\BladeParser\Parser\DocumentParser;
use Stillat\BladeParser\Compiler\CompilerServices\AttributeCompiler;

$template = <<<'TEMPLATE'
<prefix:component
  parameter="content"
  :binding="$theVariable"
/>
TEMPLATE;

$params = (new DocumentParser)
        ->onlyParseComponents()
        ->registerCustomComponentTags(['prefix'])
        ->parseTemplate($template)
        ->toDocument()
        ->getComponents()
        ->first()
        ->parameters;

$compiler = new AttributeCompiler;
$result = $compiler->compile($params);

After compilation, $result would contain the following:

['parameter'=>'content','binding'=>$theVariable]