js: use prefixed names for functions and global symbols (#11387)

vlib/builtin/js/int.js.v

@@ -2,7 +2,49 @@ module builtin
 
 pub fn (i int) str() string {
 	mut res := ''
-	#res = new builtin.string( i )
+	#res = new string( i )
+
+	return res
+}
+
+pub fn (i i64) str() string {
+	mut res := ''
+	#res = new string( i )
+
+	return res
+}
+
+pub fn (i u32) str() string {
+	mut res := ''
+	#res = new string( i )
+
+	return res
+}
+
+pub fn (i u64) str() string {
+	mut res := ''
+	#res = new string( i )
+
+	return res
+}
+
+pub fn (i bool) str() string {
+	mut res := ''
+	#res = new string( i )
+
+	return res
+}
+
+pub fn (i any) str() string {
+	mut res := ''
+	#res = new string( i.toString() )
+
+	return res
+}
+
+pub fn (i int_literal) str() string {
+	res := ''
+	#res.str = i.val.toString()
 
 	return res
 }