Expose `world:contains()` and `query:drain()` in types

[Mark-Marks]

Brief Description of your Changes.

• Expose world:contains() in World type
• Expose query:drain() in Query type
• Make world:contains() return a boolean instead of an entity which may or may not exist

Impact of your Changes

Developers can now use another two methods without casting the objects to have them Doesn't alter performance, although alters behavior if someone expects world:contains() to return an entity (impossibly unlikely, especially since the method itself was never exposed in types)

Tests Performed

Run tests and implement as directed

Additional Comments

N/A

[Mark-Marks]

query:drain() wasn't exposed for some reason in the first commit, fixed now