fix(js): increment wasm stack size to 7MB

test(js): zenroom correctly fails on input larger than 4MiB

fix: result octect length computation when decoding from base64

chore(js): update huge_input file to really have a varibale whose size is bigger than the accepted one

test(js): update test to new input

fix(zen_error): lerror does not forward optional args to zerror

Arguments were forwarded as a va_list, not the arguments list itself, thus the argument printed by zerror was not the correct one. lerror now craft the error message and pass only the latter to zerror

chore: remove some useless printing from test file

refactor(js): remove huge test file from js bindings and generate it on the fly in js tests