Add Supply.split #3187

Author: stoned

doc/Type/Supply.pod6

@@ -444,6 +444,22 @@ according to named parameter C<:end>.
     # then the $first-prime supply reaches its end
     $first-prime.tap: &say;
 
+=head2 method split
+
+    multi method split(Supply:D: \delimiter)
+    multi method split(Supply:D: \delimiter, \limit)
+
+This method creates a supply of the values returned by the C<Str.split>
+method called on the string collected from the invocant.
+See L«C<Str.split>|/type/Str#routine_split» for details on the
+C<\delimiter> argument as well as available extra named parameters.
+The created supply can be limited with the C<\limit> argument, see
+L«C<.head>|#method head».
+
+    my $words = Supply.from-list(<Hello World From Raku!>);
+    my $s = $words.split(/ <?upper> /, 2, :skip-empty);
+    $s.tap(&say); # OUTPUT: «Hello␤World␤»
+
 =head2 method rotor
 
     method rotor(Supply:D: @cycle --> Supply:D)