feat(core): Add experimental scopeValuesAppliedToLogs option

[AbhiPrasad]

We've gotten some requests for being able to get user info (from the scope) onto logs. See: https://linear.app/getsentry/issue/LOGS-21

To experiment with how this feels, we're going to try adding a new option/api to the JS SDK, scopeValuesAppliedToLogs. This right now only works for user and tags, but we might open it up for more contexts in the future.

In browser JS browser/os/device and request are all parsed from relay, so there's no SDK changes to be made here.

Usage:

Sentry.init({
  _experiments: {
    enableLogs: true,
    scopeValuesAppliedToLogs: ['user', 'tags'],
  },
});

Sentry.setTag("service", "omega_star");
Sentry.setTag("is_iso_compliant", "false");

Sentry.setUser({ id: "very_cool_developer" });

// gets attached:
// `sentry.tag.service="omega_star"`
// `sentry.tag.is_iso_compliant="false"`
// `sentry.user.id="very_cool_developer"`
Sentry.logger.info("test");

resolves https://linear.app/getsentry/issue/JSC-294