Fix data race in experimental image decoder

[jantonguirao]

Category:

Bug fix

Description:

• Fixes a rare data corruption issue observed in experimental image decoder.
• Added a WaitForWork at the end of RunImpl in image decoder, which makes sure that nvimagecodec is done using our thread pool executor.
• nvimagecodec currently has a bug that sets the promise for the batch before it has issued stream synchronization with the user stream. Adding WaitForWork forces us to wait for it to finish.

Additional information:

Affected modules and functionalities:

Key points relevant for the review:

Tests:

• Existing tests apply
• New tests added
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Checklist

Documentation

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• Documentation updated
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DALI team only

Requirements

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REQ IDs: N/A

JIRA TASK: N/A

[jantonguirao]

!build

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