Move command/ to internal/command/

This is part of a general effort to move all of Terraform's non-library
package surface under internal in order to reinforce that these are for
internal use within Terraform only.

If you were previously importing packages under this prefix into an
external codebase, you could pin to an earlier release tag as an interim
solution until you've make a plan to achieve the same functionality some
other way.

internal/command/jsonplan/resource.go

@@ -0,0 +1,74 @@
+package jsonplan
+
+import (
+	"github.com/hashicorp/terraform/internal/addrs"
+)
+
+// Resource is the representation of a resource in the json plan
+type resource struct {
+	// Address is the absolute resource address
+	Address string `json:"address,omitempty"`
+
+	// Mode can be "managed" or "data"
+	Mode string `json:"mode,omitempty"`
+
+	Type string `json:"type,omitempty"`
+	Name string `json:"name,omitempty"`
+
+	// Index is omitted for a resource not using `count` or `for_each`
+	Index addrs.InstanceKey `json:"index,omitempty"`
+
+	// ProviderName allows the property "type" to be interpreted unambiguously
+	// in the unusual situation where a provider offers a resource type whose
+	// name does not start with its own name, such as the "googlebeta" provider
+	// offering "google_compute_instance".
+	ProviderName string `json:"provider_name,omitempty"`
+
+	// SchemaVersion indicates which version of the resource type schema the
+	// "values" property conforms to.
+	SchemaVersion uint64 `json:"schema_version"`
+
+	// AttributeValues is the JSON representation of the attribute values of the
+	// resource, whose structure depends on the resource type schema. Any
+	// unknown values are omitted or set to null, making them indistinguishable
+	// from absent values.
+	AttributeValues attributeValues `json:"values,omitempty"`
+}
+
+// resourceChange is a description of an individual change action that Terraform
+// plans to use to move from the prior state to a new state matching the
+// configuration.
+type resourceChange struct {
+	// Address is the absolute resource address
+	Address string `json:"address,omitempty"`
+
+	// ModuleAddress is the module portion of the above address. Omitted if the
+	// instance is in the root module.
+	ModuleAddress string `json:"module_address,omitempty"`
+
+	// "managed" or "data"
+	Mode string `json:"mode,omitempty"`
+
+	Type         string            `json:"type,omitempty"`
+	Name         string            `json:"name,omitempty"`
+	Index        addrs.InstanceKey `json:"index,omitempty"`
+	ProviderName string            `json:"provider_name,omitempty"`
+
+	// "deposed", if set, indicates that this action applies to a "deposed"
+	// object of the given instance rather than to its "current" object. Omitted
+	// for changes to the current object.
+	Deposed string `json:"deposed,omitempty"`
+
+	// Change describes the change that will be made to this object
+	Change change `json:"change,omitempty"`
+
+	// ActionReason is a keyword representing some optional extra context
+	// for why the actions in Change.Actions were chosen.
+	//
+	// This extra detail is only for display purposes, to help a UI layer
+	// present some additional explanation to a human user. The possible
+	// values here might grow and change over time, so any consumer of this
+	// information should be resilient to encountering unrecognized values
+	// and treat them as an unspecified reason.
+	ActionReason string `json:"action_reason,omitempty"`
+}