Currently, TypeMap doesn't support non-primitive type values.
ref : hashicorp/terraform-plugin-sdk#62

When using non-primitive values with TypeMap, terraform crashes at
runtime with a following error message.

```
panic: Unknown validation type: 6
```

This error is originated at
https://github.com/hashicorp/terraform-plugin-sdk/blob/v2.11.0/helper/schema/schema.go#L2017
Only TypeBool, TypeInt, TypeFloat and TypeString are supported.

So, in this change, use TypeList with new custom resource to store
non-primitive values.

Cause filters and its child attributes don't care about ordering of
values.