Optimization proposal, getResolvedMetadata

Hi!

Can it be better to read from a file on demand?

Line 184 in 990ca4a

    
           templateMetadata.template = this.resourceResolver.getSync(templateMetadata.templateUrl);

Only when it is necessary to execute getTemplateAst?

For example, in this place?

ngast/lib/directive-symbol.ts

Lines 292 to 294 in 990ca4a

    
           const dirMetadata = this.getResolvedMetadata(); 
        
           if (dirMetadata) { 
        
             const source = dirMetadata.template;

I don't need to get all the styles, just the template.
And if a method of obtaining is called somewhere, then take from the cache.

	const dirMetadata = this.getResolvedMetadata();
	if (dirMetadata) {
	const source = dirMetadata.template;