ref(config): Rework how configs are handled

[iambriccardo]

This PR improves the handling of configurations with the following changes:

• Adds support for yaml, yml and json configs.
• Adds a APP_CONFIG_DIR environment variable to allow for custom path configuration for the configuration.
• Correctly names json configs with the .json extension when creating the config map for the replicator.
• Remove the useless embedding of configuration objects from the repository into the docker images.
• Adds tests for the configuration loading.

[coveralls]

Pull Request Test Coverage Report for Build 19532593692

Details

• 170 of 205 (82.93%) changed or added relevant lines in 6 files are covered.
• 27 unchanged lines in 4 files lost coverage.
• Overall coverage increased (+0.02%) to 82.529%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
etl-api/src/routes/pipelines.rs	0	1	0.0%
etl-replicator/src/config.rs	0	1	0.0%
etl-api/src/k8s/http.rs	16	20	80.0%
etl-api/src/main.rs	0	4	0.0%
etl-config/src/load.rs	137	162	84.57%

Files with Coverage Reduction	New Missed Lines	%
etl-api/src/k8s/http.rs	1	90.89%
etl/src/workers/table_sync.rs	2	77.41%
etl-postgres/src/tokio/test_utils.rs	4	89.97%
etl/src/replication/client.rs	20	85.83%

Totals
Change from base Build 19500901379:	0.02%
Covered Lines:	16354
Relevant Lines:	19816

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💛 - Coveralls