fix: Add internal/generated/imports.go for vendoring of generated sources

The move to using generated schemas meant that 'go mod vendor' didn't see
the imports in the generated code.  This commit adds an otherwise empty
imports.go that contains the imports so offline builds can continue to
work.  It's hidden behind a //go:build imports so there's no impact at
build or runtime.

Author: jeffmahoney

internal/generated/imports.go

@@ -0,0 +1,16 @@
+// go:build imports
+package generated
+
+// This is only here for vendoring
+
+import (
+	_ "github.com/hashicorp/terraform-plugin-framework/attr"
+	_ "github.com/hashicorp/terraform-plugin-framework/resource/schema"
+	_ "github.com/hashicorp/terraform-plugin-framework/resource/schema/boolplanmodifier"
+	_ "github.com/hashicorp/terraform-plugin-framework/resource/schema/int64planmodifier"
+	_ "github.com/hashicorp/terraform-plugin-framework/resource/schema/planmodifier"
+	_ "github.com/hashicorp/terraform-plugin-framework/resource/schema/stringplanmodifier"
+	_ "github.com/hashicorp/terraform-plugin-framework/types"
+	_ "github.com/hashicorp/terraform-plugin-framework/types/basetypes"
+	_ "libvirt.org/go/libvirtxml"
+)