support for artifact bundles (release-based sourcemap uploading is deprecated)

[aroman]

It seems that Sentry has deprecated the release-based sourcemap uploading system used by toucan-js, and instead switched to a new system called "artifact bundles".

Unfortunately, it seems that toucan doesn't support this system yet.

At minimum (but I believe there is more to do as well), it looks like we need to use sentry version 7.47.0 — this library is currently using 7.43.0.

Is this something you plan to support?