feat(instrumentation-aws-sdk): add context to SNS Publish Batch command

[dormesica]

Which problem is this PR solving?

Solves #2707

Short description of the changes

Simply took the same approach as was done with SQS Send Batch (here)

[linux-foundation-easycla[bot]]

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[pichlermarc]

Hi @dormesica, thank you for your PR.

Due to organization policy, we unfortunately cannot accept PRs unless the CLA signed. Please see here for information on how to sign it. Feel free to open a new PR once you have signed the CLA, thanks!