Description

Implemented ManualAssignPartitionOffsets to allow consumers to start consuming from a specified offset.

Fixes #584

How Has This Been Tested?

I've added ManualAssignPartitionOffsetsTest into the integration test suite. This uses the bootstrapped service provider to place 10 messages into a topic initially. It then creates a new service provider with a consumer to start at offset 5. The test verifies that the consumer only consumes messages at offsets 5 - 9.
I've added a ServiceProviderHelper to aid in the creation of the provider and refactored the GlobalEventTests to reduce code duplication.

Manual tests to verify consumers are starting from the specified offsets.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have added tests to cover my changes
• I have made corresponding changes to the documentation

Notes

I had to convert SaslOauthbearerMethod.cs to a file-scoped namespace or the solution would not build. Happy to revert this if needed.

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