Neuro SDK/CLI 21.9.3a2

Features

• Added support of blob storage for azure clusters. (#2284)
• Added support of blob storage for gcp clusters. (#2293)
• Added --read-only flag to neuro blob mkcredentials to allow creation of read-only credentials. (#2295)
• Added neuro blob importbucket command to import external bucket. External buckets support
  the same operations (neuro blob ls/cp/rm/glob), but it is impossible to generate persistent credentials
  for them using "neuro blob mkcredentials". (#2297)
• Added neuro blob sign-url <blob-uri> command for generation of urls that grant temporal access to blob. (#2299)
• Added command neuro blob set-bucket-publicity <bucket> <"public"|"private"> to make bucket accessible for unauthorized
  users. (#2306)
• Undeprecate neuro job save command, we decided to support this functionality in future. (#2336)