Add arguments to JS to C++ reset() bind

[Nydauron]

Need to figure out how Emscripten bindings work (particularly for arrays).

Arguments for reset():

• int max_ctx TBD if we should bake this into the code (ig we just change the underlying function to not modify max_contexts)
• int[] active_ctxs contexts that will be actively run. This will come in handy when wanting to run a single bot under a particular context (for Spimbot, specifically)