Revert "Exposing a Realms groups compute_aggregated_byte_size via `computeSize`"
Revert "Exposing a Realms groups compute_aggregated_byte_size via `computeSize`"

This reverts commit 10c127542beba5c4b8757396210dfcd26d7749c8.

realm/realm-js,realm/realm-js,realm/realm-js,realm/realm-js,realm/realm-js,realm/realm-js,realm/realm-js,realm/realm-js,realm/realm-js