feat(gift): 선물 응답 모델을 추가한다

work/tests/check-gift-decoding-contract.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+set -eu
+
+root=$(CDPATH= cd -- "$(dirname -- "$0")/../.." && pwd)
+tmp=$(mktemp -d)
+trap 'rm -rf "$tmp"' EXIT
+
+swiftc \
+  "$root/SodaLive/Sources/Common/ApiResponse.swift" \
+  "$root/SodaLive/Sources/Common/ApiResponseWithoutData.swift" \
+  "$root/SodaLive/Sources/V2/Gift/Models/GiftModels.swift" \
+  "$root/work/tests/GiftDecodingContractCheck.swift" \
+  -o "$tmp/gift-decoding-contract-check"
+
+"$tmp/gift-decoding-contract-check"