Function canInteract

Example

const body1 = { group: 0b00000000_00000000_00000001_00000000 }
const body2 = { group: 0b11111111_11111111_00000011_00000000 }
const body3 = { group: 0b00000010_00000000_00000100_00000000 }

// Body 1 has the first custom group but cannot interact with any other groups
// except itself because the first 16 bits are all zeros, only bodies with an
// identical value can interact with it.
canInteract(body1, body1) // returns true (identical groups can always interact)
canInteract(body1, body2) // returns false
canInteract(body1, body3) // returns false

// Body 2 has the first and second group and can interact with all other
// groups, but only if that body also can interact with is custom group.
canInteract(body2, body1) // returns false (body1 cannot interact with others)
canInteract(body2, body2) // returns true (identical groups can always interact)
canInteract(body2, body3) // returns true

// Body 3 has the third group but can interact with the second group.
// This means that Body 2 and Body 3 can interact with each other but no other
// body can interact with Body 1 because it doesn't allow interactions with
// any other custom group.
canInteract(body3, body1) // returns false (body1 cannot interact with others)
canInteract(body3, body2) // returns true
canInteract(body3, body3) // returns true (identical groups can always interact)
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