Create a helper function to poll for knowledge base indexing completion

[bbatha]

When a Gradient AI Platform Knowledge Base is indexed can run for several minutes. Currently users must write loops to poll for the job state, roughly.

from gradient import Gradient

client = Gradient()
while True:
  indexing_job = client.knowledge_bases.indexing_jobs.retrieve(
      "uuid",
  )
 if indexing_job.job.phase in ["BATCH_JOB_PHASE_UNKNOWN", "BATCH_JOB_PHASE_PENDING", "BATCH_JOB_PHASE_RUNNING"]:
    continue

This should of course handle failed states for errors and such