Implement Go language binding (#1196)

Implement Go binding APIs of runtime, module and instance
Add sample, build scripts and update the document

Co-authored-by: venus-taibai <97893654+venus-taibai@users.noreply.github.com>

language-bindings/go/wamr/runtime_test.go

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+package wamr
+
+import (
+    "github.com/stretchr/testify/assert"
+    "testing"
+)
+
+func TestRuntime(t *testing.T) {
+    res := false
+    if (Runtime() != nil) {
+        res = true;
+    }
+    assert.Equal(t, res, true)
+
+    err := Runtime().Init()
+    assert.NoError(t, err)
+    Runtime().Destroy()
+
+    err = Runtime().FullInit(false, nil, 6)
+    assert.NoError(t, err)
+    Runtime().Destroy()
+
+    err = Runtime().FullInit(false, nil, 0)
+    assert.NoError(t, err)
+    Runtime().Destroy()
+
+    heap_buf := make([]byte, 128 * 1024)
+    err = Runtime().FullInit(true, heap_buf, 4)
+    assert.NoError(t, err)
+    Runtime().Destroy()
+
+    Runtime().FullInit(false, nil, 0)
+    err = Runtime().FullInit(false, nil, 0)
+    assert.NoError(t, err)
+    Runtime().Destroy()
+    Runtime().Destroy()
+}