input string
number of grapheme clusters
var out = numGraphemeClusters( 'last man standing' );
// returns 17
var out = numGraphemeClusters( 'presidential election' );
// returns 21
var out = numGraphemeClusters( '🌷' );
// returns 1
var out = numGraphemeClusters( 'अनुच्छेद' );
// returns 5
Returns the number of grapheme clusters in a string.