Add an example with explicitly configured providers (for aws and aws-native) with remapped resources

[viveklak]

Short of configuring with the default credentials for aws and aws-native using environment variables (which use the standard AWS authentication env vars), it appears for most workloads we would have instantiate providers of each type as a component resource option. IIUC this also limits us to using a single provider for aws and aws-native respectively for a CDK stack. This may or may not be acceptable. Regardless, this subtlety should be documented with an example.