Add eu-central-2 region

[nicolas-geniteau]

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Reference: #334

AWS opens a new region in Switzerland (Zurich):
https://aws.amazon.com/fr/blogs/aws/a-new-aws-region-opens-in-switzerland/

[hashicorp-cla]

All committers have signed the CLA.

[ewbankkit]

LGTM 🚀.

% go test ./...   
ok  	github.com/hashicorp/aws-sdk-go-base/v2	1.129s
?   	github.com/hashicorp/aws-sdk-go-base/v2/internal/awsconfig	[no test files]
?   	github.com/hashicorp/aws-sdk-go-base/v2/internal/config	[no test files]
?   	github.com/hashicorp/aws-sdk-go-base/v2/internal/constants	[no test files]
ok  	github.com/hashicorp/aws-sdk-go-base/v2/internal/endpoints	0.144s
ok  	github.com/hashicorp/aws-sdk-go-base/v2/internal/expand	0.164s
?   	github.com/hashicorp/aws-sdk-go-base/v2/internal/test	[no test files]
?   	github.com/hashicorp/aws-sdk-go-base/v2/mockdata	[no test files]
?   	github.com/hashicorp/aws-sdk-go-base/v2/servicemocks	[no test files]
ok  	github.com/hashicorp/aws-sdk-go-base/v2/useragent	0.235s

[ewbankkit]

For @gdavison to merge/release.

[ewbankkit]

@nicolas-geniteau Thanks for the contribution 🎉 👏.
We'll get a release of aws-sdk-go-base done and merged into terraform-aws-provider in time for this week's release.