Add a util function to convert string and bytes array

[dentiny]

Reading through the code, I found we have several places converting between byte array and string type.
For example:

• kuberay/ray-operator/controllers/ray/common/job.go

  Line 29 in ece1d34

  return string(jsonData), nil

• kuberay/ray-operator/controllers/ray/common/job.go

  Line 62 in ece1d34

  return string(metadataBytes), nil

Add a util function to apply zero-copy strategy to these conversions.

[kevin85421]

Can you add some comments

[dentiny]

Can you add some comments

Sure, add a warning to the post-condition, also an example for usage.