Ack partial of a batch of messages

[efiShtain]

Description

When providing a handleMessageBatch function, code currently allows ack all messages or throw an error which will reject all messages. The fix allows the user to return an array of successful messages which will be deleted from the queue, the rest of the messages will return to the queue

Motivation and Context

Added for personal use and response to issue 245 https://github.com/bbc/sqs-consumer/issues/245

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [X] My code follows the code style of this project.
• [X] My change requires a change to the documentation.
• [X] I have updated the documentation accordingly.
• [X] I have read the CONTRIBUTING document.
• [X] I have added tests to cover my changes.
• [X] All new and existing tests passed.

[oursodon]

I'd love to see this PR merged 🙏

[b0xtch]

This would be really helpful

[mcflypl]

I am waiting for merge this pull request :)

[ellisium]

Any feedback if it will be merged? And if yes, when will it be?

[franciscomemoli]

I need this too. Anyone using this lib needs it, is the only way to process in batch and handle erros.

[vyrtus15]

@nspragg @robinjmurphy UP

[markussiebert]

Would be nice to see this getting merged :-)

[chiarag]

We would be really chuffed if this would be merged ;) Any status on this?

[nicholasgriffintn]

I see there are a fair amount of comments on this, however, it is out of date by a little, would be good to update this and then we can look at it in a future milestone.

[github-actions[bot]]

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