Generics migration (#237)

* Generics migration

This attempts to migrate this library in the least invasive way by preserving as
much of the original API as possible. It does not change the tests in a
meaningful way nor does it attempt to upgrade any logic that can be simplified
or improved with generics. This is purely an API migration, and still requires a
lot of additional work to be fully ready.

* Fix a few broken tests around serialization

* Add v2 suffix

* Temporarily change mod name for testing

* Rename module to /v2

examples/arrayqueue/arrayqqueue.go

@@ -4,11 +4,11 @@
 
 package main
 
-import aq "github.com/emirpasic/gods/queues/arrayqueue"
+import aq "github.com/emirpasic/gods/v2/queues/arrayqueue"
 
 // ArrayQueueExample to demonstrate basic usage of ArrayQueue
 func main() {
-	queue := aq.New()      // empty
+	queue := aq.New[int]() // empty
 	queue.Enqueue(1)       // 1
 	queue.Enqueue(2)       // 1, 2
 	_ = queue.Values()     // 1, 2 (FIFO order)