RandomSecret batch create keys

[saksmt]

API in vault allows for batch create/update of data in kv. Would be nice to have RandomSecret version accepting whole batch of keys to init:

spec:
  path: kv-mount-path
  name: name-of-secret
  data:
    key1:
      passwordPolicyName: pasword-policy
      # or
      inlinePasswordPolicy: "length ..."
    key2: # ...

Challenges/considerations:

• inlinePasswordPolicy for each key could be a bit too bloated, though it probably is non-concern since there is a way to just create them beforehand and use passwordPolicyName
• refreshPeriod becomes questionable and should probably be at key level

Currently absence of this feature does not allow to have more than one key in a secret and all consequent usages of RandomSecret just overrides entire secret