Allow setting `BaseEndpoint` on `config.LoadOptions`

[gdavison]

Describe the feature

The config.SharedConfig and config.EnvConfig structs both have a parameter BaseEndpoint that sets a common endpoint URL for all services. config.LoadOptions does not have the corresponding parameter.

Also add the corresponding config.WithBaseEndpoint functional option.

Use Case

While an endpoint resolver could be configured with a base endpoint, adding BaseEndpoint would make a more consistent interface, as well as allowing the SDK to handle the override logic including service-specific endpoints and ignoring configured endpoints.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• [X] I may be able to implement this feature request
• [ ] This feature might incur a breaking change

AWS Go SDK V2 Module Versions Used

github.com/aws/aws-sdk-go-v2 v1.24.0 github.com/aws/aws-sdk-go-v2/config v1.26.1

Go version used

go version go1.21.0 darwin/arm64