[Feature] Get the SHA256 checksum of the VSIX file from the API

[ShamrockLee]

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• Motivation

  • Hashing helps check whether the package is the same as the one being uploaded, and SHA256 is a common hash algorithm.
  • Having the ability to fetch the SHA256 checksum (hash) of each package without actually downloading them would greatly accelerate the automation of software packaging, since some package manager requires the package author to specify the hash of the downloaded files.

• Expected behavior

  • Being able to fetch the SHA256 checksum from the open-vsx API.