Increase default parameters

[jekka001]

Pull Request description

Changed default values:
EDGES_SCHEDULER_POOL_SIZE
EDGES_SEND_SCHEDULER_POOL_SIZE
EDGES_GRPC_CALLBACK_POOL_SIZE

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• Description references specific issue.
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Back-End feature checklist

• Added corresponding unit and/or integration test(s). Provide written explanation in the PR description if you have failed to add tests.
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