Inference Cache

[wanliAlex]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Feature

• What is the current behavior? (You can also link to an open issue here)
  No inference cache

• What is the new behavior (if this is a feature change)?
  We now support inference cache in Marqo for frequent search requests

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  no

• Have unit tests been run against this PR? (Has there also been any additional testing?)
  running

• Related Python client changes (link commit/PR here)
  no

• Related documentation changes (link commit/PR here)
  no

• Other information:
  no

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes/features)
• Docs have been added / updated (for bug fixes / features)