feat: Support for attachments

Adds the ability to send attachments through the SendGrid API.

Co-authored-by: Andreas Eppinger <aeppinger@webways.ch>
Co-authored-by: Eric Peterson <elpete@users.noreply.github.com>

models/protocols/SendGridProtocol.cfc

@@ -100,6 +100,19 @@ component extends="cbmailservices.models.AbstractProtocol" {
 
         body[ "personalizations" ] = [ personalization ];
 
+        if ( structkeyExists( mail, 'mailparams' ) && isArray( mail.mailparams ) && ArrayLen( mail.mailparams ) ){
+            body[ "attachments" ] =  mail.mailParams
+                .filter( function( mailParam ) {
+                    return structKeyExists( mailParam, "file" );
+                } )
+                .map( function( mailParam ) {
+                    return {
+                        "content": toBase64( fileReadBinary( mailParam.file ) ),
+                        "filename": listLast( mailParam.file, "/" )
+                    };
+                } );
+        }
+
         cfhttp( url = "https://api.sendgrid.com/v3/mail/send", method = "POST" ) {
             cfhttpparam( type = "header", name = "Authorization", value="Bearer #getProperty( "apiKey" )#" );
             cfhttpparam( type = "header", name = "Content-Type", value="application/json" );