Replace deprecated functions as described in SDKv2 Upgrade Guide

[Nuru]

Schema elements such as Read and implementations such as ReadFunc have all been deprecated. Just one example:

terraform-provider-awsutils/internal/service/sts/caller_identity_data_source.go

Line 18 in 29632be

Read: dataSourceCallerIdentityRead,

See More Support for context.Context in the Terraform Plugin SDK v2 Upgrade Guide.

Please implement the recommended upgrades from the upgrade guide, or migrate to the Plugin Framework.