Writing Cloud files

[radeusgd]

Pull Request Description

• Closes Implement basic support for Enso_File write #9291

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[radeusgd]

After adding some basic caching:

• the Inter_Backend_File_Operations_Spec (without S3) got from 89s down to 49s,
  • and with S3 from ~5m to 3m 45s
• the Enso_File_Spec went from 64s down to 30s.
  So the caching seems like it was quite beneficial.

Currently I set the cache timeout to 60 seconds which seems like a decent trade-off between keeping data up-to-date and improving performance. Most operations that access the same file multiple times finish in under 1 second anyway, a new request that takes 0.2-1.3s every 60s seems to not affect the performance awfully.

The cache TTL can be changed or caching can be disabled if needed.