handle chunking of long lists of job submissions for users

[jhkennedy]

Currently, HyP3 only allows submitting up to 200 jobs at a time.

Most of the SDK submit functions only submit a single job, but vail the prepare methods a long list of prepared jobs can be created and submitted via submit_prepared_jobs.

The SDK provides a helper function to "chunk" submissions into sets of 200 jobs for long submissions:
https://github.com/ASFHyP3/hyp3-sdk/blob/develop/src/hyp3_sdk/util.py#L40
and error handling needs to happen for each submitted chunck.

Therefore, typical user code for submitting a large number of jobs may look like:

import hyp3_sdk as sdk
import hyp3_sdk.util
import hyp3_sdk.exceptions

hyp3 = sdk.HyP3()

jobs = [...]  # A list of jobs > 200 in length

submitted_jobs = sdk.Batch()
failed_to_submit_jobs = []
for batch in sdk.util.chunk(jobs):
    try:
        submitted_jobs += hyp3.submit_prepared_jobs(batch)
    except sdk.exeptions.HyP3SDKError:
        failed_to_submit_jobs.extend(batch)
        print('Some failure message')

It would be nice to handle the chunking for users directly in the submit_prepared_jobs function. We have yet to do so up to this point because error handling is problematic in this space (e.g., do we return a list of failed jobs too?) and we've not determined a good way to handle failures.