Add support for async `FilesAdapter.getFileLocation`

[mtrezza]

New Feature / Enhancement Checklist

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Current Limitation

The FilesAdapter protocol expects getFileLocation to be a synchronous method.

Feature / Enhancement Description

Add support for getFileLocation to be either an asynchronous or synchronous method:

• Support for asynchronous is required for file adapters that generate the file URI asynchronously, for example the S3 file adapter using a pre-signed URL, see Upgrade to AWS JS SDK v3 needed parse-server-s3-adapter#197.
• Support for synchronous is required for backward compatibility.

Example Use Case

See parse-community/parse-server-s3-adapter#197.

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[parseplatformorg]

🎉 This change has been released in version 7.3.0-alpha.7

[parseplatformorg]

🎉 This change has been released in version 7.3.0-beta.1

[parseplatformorg]

🎉 This change has been released in version 7.3.0