samples(storage transfer): add samples and test cases for storage transfer services

[mahendra-google]

Adding samples and tests cases for following storage transfer services:

• 1. storagetransfer_quickstart
• 2. storagetransfer_transfer_to_nearline
• 3. storagetransfer_get_latest_transfer_operation
• 4. storagetransfer_manifest_request
• 5. storagetransfer_transfer_from_posix
• 6. storagetransfer_download_to_posix
• 7. storagetransfer_transfer_posix_to_posix
• 8. storagetransfer_create_event_driven_gcs_transfer

[mahendra-google]

@amanda-tarafa Reference from comments I received in Internal PR in samples from .NET reviewer (PR) Just wanted to confirm whether exception handling can be implemented in samples because I don't see its implemented in storage samples also I could see dispose is not failing ?

[amanda-tarafa]

@amanda-tarafa Reference from comments I received in Internal PR in samples from .NET reviewer (PR) Just wanted to confirm whether exception handling can be implemented in samples because I don't see its implemented in storage samples also I could see dispose is not failing ?

We don't usually implement exception handling in samples unless there's a very specific error handling case you need to show. We generally consider that something as follows adds more noise than value:

try
{
    // Sample code here
}
catch(Exception ex)
{
    Console.WriteLine(ex)
}

So, no, don't implement error handling except for a very specific case that is significantly different from the code above.

[mahendra-google]

This PR is ready for re-review.

[amanda-tarafa]

@mahendra-google Please fix conflicts so I can run tests, etc. Thanks.

[mahendra-google]

@mahendra-google Please fix conflicts so I can run tests, etc. Thanks.

Tests package reference conflict is fixed.

[amanda-tarafa]

Thanks, these look better now. We can address any issue on a one by one basis.

(In general, improvements we request for other samples should be checked for these, thanks)