Add awsbase.ErrCodeEquals, AWS SDK for Go v2 variant of helper in v2/awsv1shim/tfawserr

[ewbankkit]

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Adds an AWS SDK for Go v2 variant of the ErrCodeEquals helper in v2/awsv1shim/tfawserr.
Not all services in the AWS SDK for Go v2 uses strongly-typed, modeled errors (EC2 is top of mind).
To support testing the returned API error code for these servies, add a variant of the ErrCodeEquals helper function defined in v2/awsv1shim/tfawserr that uses the smithy.APIError interface.

% go test ./...
ok  	github.com/hashicorp/aws-sdk-go-base/v2	5.656s
?   	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	0.313s
?   	github.com/hashicorp/aws-sdk-go-base/v2/internal/errs	[no test files]
ok  	github.com/hashicorp/aws-sdk-go-base/v2/internal/expand	0.629s
?   	github.com/hashicorp/aws-sdk-go-base/v2/internal/slices	[no test files]
?   	github.com/hashicorp/aws-sdk-go-base/v2/internal/test	[no test files]
?   	github.com/hashicorp/aws-sdk-go-base/v2/logging	[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	0.690s

[YakDriver]

LGTM 🎉

[ewbankkit]

Will wait for final OK from @gdavison on correct location.

[ewbankkit]

This should be github.com/aws/aws-sdk-go-v2/aws to prevent the go.mod diff.

[gdavison]

Copy and paste :(