Introduce new QUICHE_PROTOCOL_FLAG of type uint32_t

cl/640248232 introduced a new QUICHE_PROTOCOL_FLAG of type uint32_t, but we need to define the corresponding version of GetQuicheFlagImplImpl with the uint32_t type to overcome ambiguity.

PiperOrigin-RevId: 640490596

quiche/common/platform/default/quiche_platform_impl/quiche_flags_impl.h

diff --git a/quiche/common/platform/default/quiche_platform_impl/quiche_flags_impl.h b/quiche/common/platform/default/quiche_platform_impl/quiche_flags_impl.h
index 9950cc6..309c270 100644
--- a/quiche/common/platform/default/quiche_platform_impl/quiche_flags_impl.h
+++ b/quiche/common/platform/default/quiche_platform_impl/quiche_flags_impl.h
@@ -27,6 +27,7 @@
 inline bool GetQuicheFlagImplImpl(bool flag) { return flag; }
 inline int32_t GetQuicheFlagImplImpl(int32_t flag) { return flag; }
 inline int64_t GetQuicheFlagImplImpl(int64_t flag) { return flag; }
+inline uint32_t GetQuicheFlagImplImpl(uint32_t flag) { return flag; }
 inline uint64_t GetQuicheFlagImplImpl(uint64_t flag) { return flag; }
 inline double GetQuicheFlagImplImpl(double flag) { return flag; }
 inline std::string GetQuicheFlagImplImpl(const std::string& flag) {