`datacontract dbt sync` should not be case-sensitive for schema names

[jschoedl]

For schemas with uppercase names and dbt models with lowercase names, datacontract dbt sync does not work and does not log a helpful error:

Resolved contract (...)/contract.odcs.yaml
Wrote 1 YAML file(s) under (...)/models/datacontract_cli.
No test results parsed.

We should:

• match case-insensitively (special case: both orders and ORDERS exist)
• log a warning if we can't match ODCS schemas and dbt models