📕REST API does not contain file metadata & tags references

[mtrezza]

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References: https://github.com/parse-community/parse-server/issues/6771

Proposed solution: After https://docs.parseplatform.org/rest/guide/#deleting-files, like in the JS docs

Suggested content: See https://docs.parseplatform.org/js/guide/#adding-metadata-and-tags

[evtimDev]

One important caveat for sending the fileData as json in the body is one should not add the applicationId in the header, because otherwise the json parsing of the body will be skipped:

https://github.com/parse-community/parse-server/blob/fe02d3e8aa875f362377cc877a65831b010b00a6/src/middlewares.js#L79-L93