ICU-743/Domain errors internal/kms refactor (#848)

* Domain errors internal/kms refactor

* Update changelog

* Update internal/host error op

* Incorrect error returned in read_writer

internal/errors/code_test.go

@@ -52,6 +52,11 @@ func TestCode_Both_String_Info(t *testing.T) {
 			c:    EmptyFieldMask,
 			want: EmptyFieldMask,
 		},
+		{
+			name: "KeyNotFound",
+			c:    KeyNotFound,
+			want: KeyNotFound,
+		},
 		{
 			name: "PasswordTooShort",
 			c:    PasswordTooShort,
@@ -72,6 +77,16 @@ func TestCode_Both_String_Info(t *testing.T) {
 			c:    PasswordsEqual,
 			want: PasswordsEqual,
 		},
+		{
+			name: "Encrypt",
+			c:    Encrypt,
+			want: Encrypt,
+		},
+		{
+			name: "Decrypt",
+			c:    Decrypt,
+			want: Decrypt,
+		},
 		{
 			name: "CheckConstraint",
 			c:    CheckConstraint,