[CT-908] Allow generic tests to accept arbitrary configs

[jtcohen6]

Motivation: https://github.com/dbt-labs/dbt-snowflake/pull/210#discussion_r929104933

This is supported:

version: 2
models:
  - name: my_model
    config:
      any_key: any_value

But this isn't:

version: 2
models:
  - name: my_model
    columns:
      - name: id
        tests:
          - unique:
              config:
                any_key: any_value

I think it's because dbt only loads up the test's config property with values from CONFIG_ARGS:

https://github.com/dbt-labs/dbt-core/blob/3f54f303492b411a377f6724a9cfb685950b5de0/core/dbt/parser/generic_test_builders.py#L250-L262

Exit criteria: Tests' config property should be able to accept any arbitrary key-value pairs, just like other resource types. Those configs can then be used to set runtime behavior, e.g. in a custom 'test' materialization.

[emmyoop]

Will need to change the above for key in self.CONFIG_ARGS: to loop through all the keys in the dict, and if it's CONFIG_ARGS it's adde dot the config and if it's not it's a keyword arg. Then we need to loop through the subdictionay config and save everything as a config.

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