[Draft] Generate Regional endpoints #394
Draft
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Description of changes:
Adds a hook for integrations to register an endpoints generator that is responsible for generating client configuration and resolution logic.
Adds an Aws Standard Regional Endpoints generation path that adds region to client config and generates logic to use a simple pattern based regional endpoint resolver.
The generic hook for endpoint generation can be used in the future to implement Endpoints2.0 both generically or in Aws flavors (specifically accounting for AWS builtins / std lib functions).
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