Returns a map of all elements sorted by value.
Example:
mapOf(5 to 1, 10 to 10, 1 to 0).sortedByValue() // {1:0, 5:1, 10:10}mapOf("11" to 1, "1" to 10, "a" to 0).sortedByValue() // {"1":10, "11":1, "a":0}
1.1.0