Migrate internal/testing/types package to internal/testtypes package

[bflad]

Module version

v1.2.0

Use-cases

The framework includes some test value types in the internal/testing/types package. However since the import name matches the exported value types in the types package, most usages need to use an import alias:

import (
  // ...
  testtypes "github.com/hashicorp/terraform-plugin-framework/internal/testing/types"
  // ...
)

This also confuses the Go language server and automatic editor suggestions to add the test types import since the package information cannot be determined by typing types... or testtypes....

Proposal

git mv internal/testing/types internal/testtypes and replace package types in internal/testtypes files with package testtypes. Replace any testtypes "github.com/hashicorp/terraform-plugin-framework/internal/testing/types" imports with "github.com/hashicorp/terraform-plugin-framework/internal/testtypes".

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