Use OpenTofu planner with Plugin Framework providers (#2188)

OpenTofu planner code is now used with Plugin Framework providers to
emulate Terraform CLI behavior for `objchange.ProposedNew`. Note that
this code was already in use for SDKv2-based resources prior to the
change. The vendored code replaces a custom implementation that is now
removed.

Fixes #2172

Observable changes: Plugin Framework based resources may now reorder
outputs for Set collections.

This change is known to fix bugs such as
#2192 - to be
confirmed with a regression test in a follow-up PR.

.golangci.yml

@@ -28,6 +28,7 @@ issues:
     - pkg/tf2pulumi/internal/addrs
     - pkg/tf2pulumi/internal/config
     - pkg/tf2pulumi/internal/configs
+    - pkg/vendored
 linters-settings:
   gci:
     sections:

dynamic/testdata/TestPrimitiveTypes/diff(some).golden

@@ -2,6 +2,7 @@
   "changes": "DIFF_SOME",
   "diffs": [
     "attrNumberComputed",
+    "attrNumberRequired",
     "attrStringDefault",
     "attrStringDefaultOverridden",
     "attrStringRequired"

pf/go.mod

@@ -219,7 +219,7 @@ require (
 	github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
 	github.com/xeipuuv/gojsonschema v1.2.0 // indirect
-	github.com/zclconf/go-cty v1.14.2 // indirect
+	github.com/zclconf/go-cty v1.14.2
 	go.opencensus.io v0.24.0 // indirect
 	go.uber.org/atomic v1.9.0 // indirect
 	gocloud.dev v0.37.0 // indirect

pf/internal/pfutils/convert_rschema_to_proto.go

@@ -0,0 +1,119 @@
+// Copyright 2016-2024, Pulumi Corporation.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pfutils
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/hashicorp/terraform-plugin-framework/datasource"
+	"github.com/hashicorp/terraform-plugin-framework/provider"
+	"github.com/hashicorp/terraform-plugin-framework/providerserver"
+	"github.com/hashicorp/terraform-plugin-framework/resource"
+	rschema "github.com/hashicorp/terraform-plugin-framework/resource/schema"
+	"github.com/hashicorp/terraform-plugin-go/tfprotov6"
+)
+
+// Assist converting Plugin framework schemata to proto schemata for a resource.
+func convertResourceSchemaToProto(ctx context.Context, s *rschema.Schema) (*tfprotov6.Schema, error) {
+	p := &singleResourceProvider{s}
+
+	mk := providerserver.NewProtocol6WithError(p)
+	srv, err := mk()
+	if err != nil {
+		return nil, err
+	}
+	resp, err := srv.GetProviderSchema(ctx, &tfprotov6.GetProviderSchemaRequest{})
+	if err != nil {
+		return nil, err
+	}
+	var diagErrors []error
+	for _, d := range resp.Diagnostics {
+		if d.Severity == tfprotov6.DiagnosticSeverityError {
+			diagErrors = append(diagErrors, d.Attribute.NewErrorf("%s\n%s", d.Summary, d.Detail))
+		}
+	}
+	if err := errors.Join(diagErrors...); err != nil {
+		return nil, err
+	}
+	for _, r := range resp.ResourceSchemas {
+		return r, nil
+	}
+	return nil, fmt.Errorf("GetProviderSchema did not return any resource schemas")
+}
+
+type singleResourceProvider struct {
+	resourceSchema *rschema.Schema
+}
+
+var _ provider.Provider = &singleResourceProvider{}
+
+func (srp singleResourceProvider) Metadata(
+	ctx context.Context,
+	req provider.MetadataRequest,
+	resp *provider.MetadataResponse,
+) {
+	resp.TypeName = "p"
+}
+
+func (srp singleResourceProvider) Schema(context.Context, provider.SchemaRequest, *provider.SchemaResponse) {
+}
+
+func (srp singleResourceProvider) Configure(context.Context, provider.ConfigureRequest, *provider.ConfigureResponse) {
+}
+
+func (srp singleResourceProvider) DataSources(context.Context) []func() datasource.DataSource {
+	return nil
+}
+
+func (srp singleResourceProvider) Resources(context.Context) []func() resource.Resource {
+	mk := func() resource.Resource {
+		return &schemaOnlyResource{srp.resourceSchema}
+	}
+	return []func() resource.Resource{mk}
+}
+
+type schemaOnlyResource struct {
+	schema *rschema.Schema
+}
+
+var _ resource.Resource = &schemaOnlyResource{}
+
+func (r *schemaOnlyResource) Metadata(
+	ctx context.Context,
+	req resource.MetadataRequest,
+	resp *resource.MetadataResponse,
+) {
+	resp.TypeName = "r"
+}
+
+func (r *schemaOnlyResource) Schema(ctx context.Context, req resource.SchemaRequest, resp *resource.SchemaResponse) {
+	if r.schema != nil {
+		resp.Schema = *r.schema
+	}
+}
+
+func (r *schemaOnlyResource) Create(context.Context, resource.CreateRequest, *resource.CreateResponse) {
+}
+
+func (r *schemaOnlyResource) Read(context.Context, resource.ReadRequest, *resource.ReadResponse) {
+}
+
+func (r *schemaOnlyResource) Update(context.Context, resource.UpdateRequest, *resource.UpdateResponse) {
+}
+
+func (r *schemaOnlyResource) Delete(context.Context, resource.DeleteRequest, *resource.DeleteResponse) {
+}