Add Queue with Fixed implementation

[mycognosist]

• Add Queue trait
  • Including doc comments
• Add Fixed implementation of Queue
  • Including basic tests
• Add fuzzers for enqueue, dequeue, bulk enqueue and bulk dequeue

[AljoschaMeyer]

Generally looks good, sorry about the invariant hiccup this morning. Queues use errors to signal when they are full/empty, but it is perfectly fine to retry later. Producers/consumers work differently, they block (or suspend) until they can produce/consume more data. Queues don't have that mechanism.

[AljoschaMeyer]

For the fuzz tests, could you make sure that they catch simple errors in the fixed capacity implementation (say, deliberately introducing off-by-one errors). I can't see the progress, so for all I know, the fuzz tests passed at first go (because they are faulty and I am just not seeing it).

[mycognosist]

For the fuzz tests, could you make sure that they catch simple errors in the fixed capacity implementation (say, deliberately introducing off-by-one errors). I can't see the progress, so for all I know, the fuzz tests passed at first go (because they are faulty and I am just not seeing it).

Good idea. I introduced off-by-one errors in several places successively and each of them failed as expected.