Add S3 relation to mimir coordinator (#21)

* init s3 configs

* fix status, scenario test and linter

* using pydantic for s3 storage config

* Switching ti s3_integrator

* Added unit tests for build_config

* refactoring mimir_config members list

* linter fix

* logic refactor to address PR comments

* refactoring pydantic validation

* passing  _S3ConfigData rather than its dictified version

* fix static-lib

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Co-authored-by: Luca Bello <[email protected]>