refactor: switch from awsutil to awsutilv2 (#34)

* fix(storage): Storage Assume Role Support

This commit introduces fixes to enable operators to use AWS dynamic
credentials on the storage side of this plugin, namely validation,
improved credential lifecycle management to allow for storage buckets to
be updated from static to dynamic credentials and vice versa, and a new
way to determine credential types.

It also introduces new tests for dynamic credential usage for the
various functions.

* fix(storage): Static rotated creds being deleted on plugin err

On Storage Bucket update, when we determine if the credentials are to be
updated to new ones, we call `credState.ReplaceCreds`.

This call, if the old credentials were managed by us (rotated at create
time), will delete the old credentials and set the new ones onto
credState.

We called this function without validating if the incoming credentials
are valid. This could get the bucket in a state where where, while we'd
return an update error if the incoming credentials weren't working with
S3 (err in the dry run process that happens at the end of the update),
we'd also silently delete the old credentials the bucket used, rendering
the bucket completely broken.

---------

Co-authored-by: Hugo <hugoamvieira@users.noreply.github.com>

go.mod

@@ -4,37 +4,38 @@ go 1.20
 
 require (
 	github.com/aws/aws-sdk-go v1.44.80
-	github.com/aws/aws-sdk-go-v2 v1.18.0
-	github.com/aws/aws-sdk-go-v2/config v1.18.19
-	github.com/aws/aws-sdk-go-v2/credentials v1.13.18
+	github.com/aws/aws-sdk-go-v2 v1.20.1
 	github.com/aws/aws-sdk-go-v2/service/ec2 v1.99.0
-	github.com/aws/aws-sdk-go-v2/service/s3 v1.31.1
-	github.com/aws/smithy-go v1.13.5
+	github.com/aws/aws-sdk-go-v2/service/iam v1.22.2
+	github.com/aws/aws-sdk-go-v2/service/s3 v1.38.2
+	github.com/aws/aws-sdk-go-v2/service/sts v1.21.2
+	github.com/aws/smithy-go v1.14.1
 	github.com/google/go-cmp v0.5.9
 	github.com/google/uuid v1.3.0
 	github.com/hashicorp/boundary/sdk v0.0.33
-	github.com/hashicorp/go-secure-stdlib/awsutil v0.2.2
+	github.com/hashicorp/go-secure-stdlib/awsutil/v2 v2.0.0
 	github.com/hashicorp/terraform-json v0.14.0
 	github.com/mitchellh/mapstructure v1.5.0
-	github.com/stretchr/testify v1.8.2
+	github.com/stretchr/testify v1.8.4
 	google.golang.org/grpc v1.53.0
 	google.golang.org/protobuf v1.28.1
 )
 
 require (
-	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.10 // indirect
-	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.13.1 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.33 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.27 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/ini v1.3.32 // indirect
-	github.com/aws/aws-sdk-go-v2/internal/v4a v1.0.23 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.9.11 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.1.26 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.27 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.14.0 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sso v1.12.6 // indirect
-	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.14.6 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sts v1.18.7 // indirect
+	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.12 // indirect
+	github.com/aws/aws-sdk-go-v2/config v1.18.33 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.13.32 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.13.8 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.38 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.32 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/ini v1.3.39 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/v4a v1.1.1 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.9.13 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.1.33 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.32 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.15.1 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.13.2 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.15.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fatih/color v1.14.1 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
@@ -53,7 +54,6 @@ require (
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/pointerstructure v1.2.1 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/zclconf/go-cty v1.10.0 // indirect
 	golang.org/x/crypto v0.8.0 // indirect