[COMPLIANCE] Add Copyright and License Headers (#586)

* [COMPLIANCE] Add Copyright and License Headers

* add copywrite file and revert headers in testdata

---------

Co-authored-by: hashicorp-copywrite[bot] <110428419+hashicorp-copywrite[bot]@users.noreply.github.com>
Co-authored-by: Liam Cervante <[email protected]>

Author: hashicorp-copywrite[bot]

.copywrite.hcl

@@ -0,0 +1,16 @@
+schema_version = 1
+
+project {
+  license        = "MPL-2.0"
+  copyright_year = 2014
+
+  # (OPTIONAL) A list of globs that should not have copyright/license headers.
+  # Supports doublestar glob patterns for more flexibility in defining which
+  # files or folders should be ignored
+  header_ignore = [
+    "hclsyntax/fuzz/testdata/**",
+    "hclwrite/fuzz/testdata/**",
+    "json/fuzz/testdata/**",
+    "specsuite/tests/**",
+  ]
+}

cmd/hcldec/diags_json.go

@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (

cmd/hcldec/examples/sh-config-file/example.sh

@@ -1,4 +1,7 @@
 #!/bin/bash
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
 
 set -euo pipefail
 

cmd/hcldec/main.go

@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (

cmd/hcldec/spec.go

@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (

cmd/hcldec/spec_funcs.go

@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (

cmd/hcldec/type_expr.go

@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (

cmd/hcldec/vars.go

@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (

cmd/hclfmt/main.go

@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (

cmd/hclspecsuite/diagnostics.go

@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (