import declaration should not include semicolon or require line end

See https://github.com/Microsoft/vscode/issues/30527

The coffeescript grammar includes the JavaScript grammar.
With the following example:

`import Ember from 'ember'`
# foo bar baz
if true then console.log('qnx')

the JavaScript grammar is used to tokenize what's inside the backward quotes. Problem is that it does not return to the initial state after processing 'ember'. It expects a semicolon or the end of the line. Because of that, the JavaScript grammar scope remains and the rest of the file is colorized also with the JavaScipt grammar.

For supporting embedded cases like this, it would be great if the import declaration rule could end to end with the string literal or any non-expected symbol.

Inizia individuando la regola per la dichiarazione di importazione nei file della grammar e riproduci l’esempio CoffeeScript incorporato nell’issue. Verifica come la grammar JavaScript gestisce il literal stringa dell’importazione e ritorna alla grammar circostante. Il lavoro è completo quando l’importazione incorporata si arresta al literal stringa o a un altro simbolo non previsto, mentre il CoffeeScript seguente non viene più colorato come JavaScript.