external config improvements

[bpkroth]

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• [x] unify json schema to a single top level schema
  • Idea is that it just selects subschemas based on class prefix e.g., "class": "mlos_bench.service.*" maps to --> "service-schema.json", "mlos_bench.environment.*" maps to --> "environment-schema.jsonc", etc.
  • #596
• [ ] extend to allowing yml as input when reading configs (wishlist - not required)
  • still maps to the same schema, just a different input format
• [x] register top level json schema with url pointing to this repo and file extensions like .mlos.jsonc, .mlos.json, .mlos.yml, .mlos.yaml at https://www.schemastore.org/json/
  • this allows the schemas to work without additional configurations in the IDE
  • useful for improving examples like https://github.com/microsoft/mlos-autotuning-template and https://github.com/Microsoft-CISL/sqlite-autotuning
  • https://github.com/SchemaStore/schemastore/pull/3402
• [ ] rename internal config files to match the naming scheme published on schemastore.org (e.g., *.jsonc -> *.mlos.jsonc)
• [x] add schema checking on the config dict objects as well (e.g., at object instantiation time, not just file read time)
  • there's a number of our unit tests that only use python defined configs and were missing errors
  • #543 did that

[bpkroth]

quick wip branch: https://github.com/bpkroth/MLOS/tree/single-schema-definition-support