Allow option `publicServerURL` to be set as async function

[mtrezza]

New Feature / Enhancement Checklist

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Current Limitation

The option publicServerURL is static and can only be set once on server start. Since this is a public facing URL, it may be necessary in certain scenarios to update it, which currently requires a server restart.

Feature / Enhancement Description

Allow option publicServerURL to be set as an async function.

Example Use Case

• Domain failover

Alternatives / Workarounds

Restart server which has a resource impact.

[parse-github-assistant[bot]]

🚀 Thanks for opening this issue! We are excited about your ideas for improvement!

[parseplatformorg]

🎉 This change has been released in version 8.5.0-alpha.1