This MP4 format "sanitizer" currently only transforms (when necessary) outgoing media on iOS, Android, or Desktop to
make it suitable for streaming playback by the recepient. In the future, it will validate and be able to either repair
or reject outbound AND inbound media, to prevent malformed media from being fed to third party or OS media players.
An generic io module was added to the libsignal rust bridge containing the InputStream trait, modeled loosely after
Java's InputStream, which calls back into the client language to perform reads or skips. This infrastructure could
potentially also be for any other future large data inputs to libsignal functions.
Previously all APIs were available through the top-level index.ts, but
now the zkgroup APIs are in their own module. To access that in the
old packaging required writing
import * from '@signalapp/signal-client/node/dist/zkgroup'
This commit moves the package root into the node/ directory to
eliminate the 'node/' component, then adds a top-level, precompiled
zkgroup.js/.d.ts so that clients can use
import * from '@signalapp/signal-client/zkgroup'
