[runtime] Generate random queue descriptors

[iyzhang]

Context

Currently our queue descriptors start at 500 and increase monotonically.

Proposed Solution

Move the queue descriptors to the IdMap data structure to generate random ids. There are a few blockers here:

1. Queue descriptors are currently 32 bits while the IdMap only supports 64 bit identifiers
2. The simulator expects queue descriptors to be allocated in a particular way because it does not support storing queue descriptors and using them.

Alternative Solutions

Leave the queue descriptors the way that they are.