Allow registering of custom resolvers to OmegaConfigLoader through CONFIG_LOADER_ARGS

[ankatiyar]

Description

Allowing users to register custom resolvers will make it easy for users to do more advanced interpolation in their configs.
OmegaConf documentation about custom resolvers - https://omegaconf.readthedocs.io/en/2.3_branch/custom_resolvers.html

Context

Follow up task for #2407

Possible Implementation

Users should be able to add custom resolvers in their settings.py files -

from kedro.config import OmegaConfigLoader


CONFIG_LOADER_CLASS = OmegaConfigLoader

CONFIG_LOADER_ARGS = {
    "custom_resolvers": {
        "add": lambda *x: sum(x),
    }
}

The config files then could look like this -
parameters.yml

model_options:
  test_size: ${add:1,2,3}
  random_state: 3

• The implementation of this on the OmegaConfigLoader side should be a very thin wrapper for OmegaConf.register_new_resolver() so that any future changes to OmegaConf don't affect anything on Kedro side.
• Users can overwrite built-in resolvers using replace=True

[noklam]

Do we need anything special to enable this? The only thing we need to do is add custom_resolvers as an argument to OmegaConfigLoader.

Then test both scenarios works

1. Custom Resolvers can be registered when using standalone
2. custom_resolvers can be registered via settings.py (This should just work since it's just an additional argument, we always pass all of them to the constructor anyway)