Aio-aws

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- Revise jobs-db to fallback on job.submitted for latest job by name
- Add a job submission timestamp to AWSBatchJob
- Allow batch utils to provide a custom config

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- Revise redis batch-db client details

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- Use lazy aioredis connection

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- Enhance and test batch-job filter utilities

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- Refactor and enhance aio-batch utility functions

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- Update docs
- refactor aio-batch-db as optional integration
- add aio-redis option for batch-db
- Refactor common retry exception codes