Add/remove multiple components/tags at once

Currently, `World` provides `add_tag()` and `add_component()` which add tags and components to an entity. However, these functions are somewhat expensive due to the moving of entities between archetypes, and calling them once for each component which should be added is undesirable.

Functions `add_tags()` and `add_components()`, or similar, should be added to allow for optimizing the creation of multiple components or tags.