[diagnostics-app] support multiple audiences

[rkistner]

• Support extracting the endpoint from a token with multiple audiences
• Support self-hosted / generic http endoints.

This can help to reduce friction slightly when using the diagnostics app for local development.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: d3379c5bf601748ffd6d30ad49f5efa23a2d160f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | -------------------------- | ----- | | @powersync/diagnostics-app | Patch |

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