feat: Fallback for user ID on console

[bitsandfoxes]

Resolves #2268

Problem

AnalyticsSessionInfo.userId cannot be used on all platforms - i.e. Switch. We need to find a proper replacement. Ideally one, that works on all platforms.

Proposal

To unblock running the SDK, check which platform we're running on before calling into AnalyticsSessionInfo.userId;

Context

Console are basically treated as desktop platforms from the SDK's POV. When supported by sentry-native the Sentry.Native Configure gets called to handle the native initialization and scope sync setup.

Follow up on this with fetching installation ID from the native layer. Relies on: getsentry/sentry-native#1324

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- Fallback for user ID on console ([#2309](https://github.com/getsentry/sentry-unity/pull/2309))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description or adding a skip-changelog label.

Generated by 🚫 dangerJS against c91b85d