fix(endpoint): normalize endpoint to string when passing from client config to endpointParams

[kuhe]

Issue

#4076
#4095

Description

convert endpoint to string when passing from client config (where it may have been converted to a v1 endpoint by resolveEndpointConfig) to the endpointParams resolver input object.

• client.config.endpoint can be a string, V1, or V2 endpoint object
• resolveEndpointConfig normalizes all of these to a Provider<Endpoint>
• when the endpointParams are generated from the config mapping instructions, the provider is resolved but the object is not converted to a string, which is expected by the endpoints spec and ruleset.

Testing

• added unit tests
• manual testing with dynamodb client

[kuhe]

tested various commands with

const client: DynamoDBClient = new DynamoDBClient({
  region: "us-east-1",
  logger: console,
  endpoint: "https://dynamodb.us-east-1.amazonaws.com",
});

[github-actions]

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