[request]: Make it easier to re-use shared config with some minor tweaks

[jdisanti]

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Tell us about your request

aws_config::Config should have a to_builder() or Builder::from(config) so that a single field on the config can be easily swapped out rather than creating a builder and copying every field over one by one from the other config.

Tell us about the problem you're trying to solve.

Say I have a config, but I want to change the credentials provider for another use-case. There should be a way to just change that credential provider rather than having to create a new Config::Builder and copy every field over.

Are you currently working around this issue?

Working around by using a builder and copying over every field.

Additional context

No response

[Jacco]

Would this also be solved if the have Clone?

Am working on a PR in smithy-rs

https://github.com/awslabs/smithy-rs/pull/985

[rcoh]

this is a little different. This refers to aws_types::Config, a handwritten struct. Once you have a Config, it is immutable which makes altering it a little cumbersome. (the smithy-rs#985 impacts generated builders)

[ysaito1001]

This is now supported (doc)

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