Implement `.find_many()` on `Entity`

[ra0x3]

• With the completion of #1437 we now have .find() usage
• The next thing we want is the implementation of .find_many()
• .find_many() would work just like .find() except it instead of returning Option<Entity> it would return Option<Vec<Entity>>
• We would have to establish some constraints/parameters around the size of the result set of .find_many()
  • Since we allocate space in the runtime for the result of .find() (and .get()) we would need to set some max size that can be allocated for .find_many() results
    • Maybe this is configurable?