Google-cloud-python: autodetect schema parameter in Table.upload_from_file

[aovlexus]

I think it's necessary to add parameter autodetect_chema to function upload_from_file of Table class, this is done by writing corresponding parameter to the matadata dict in this function. But I do not have enough experience to write this code in accordance with the project architecture and tests for this function.

[tseaver]

@aovlexus Thanks for the report! @tswast is in the middle of a redesign of the API, which should accomplish your goal.

[tswast]

Fixed by https://github.com/GoogleCloudPlatform/google-cloud-python/pull/4136 where the load function now takes an optional job_config parameter, where this property can be populated.

To be merged to master in https://github.com/GoogleCloudPlatform/google-cloud-python/pull/4245.