[Yunq] Add a basic yunq test into libyunq.

lib/yunq/test/example/example.yunq

@@ -0,0 +1,5 @@
+package ex;
+
+message Basic {
+  u64 field;
+}

lib/yunq/test/example/example.yunq.cpp

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+// Generated file -- DO NOT MODIFY.
+#include "example.yunq.h"
+
+#include <yunq/message_view.h>
+#include <yunq/serialize.h>
+
+
+namespace ex {
+
+namespace {
+
+const uint64_t header_size = 24;  // 4x uint32, 1x uint64
+
+struct ExtPointer {
+  uint32_t offset;
+  uint32_t length;
+};
+
+}  // namespace
+glcr::Status Basic::ParseFromBytes(const yunq::MessageView& message) {
+  RETURN_ERROR(ParseFromBytesInternal(message));
+  return glcr::Status::Ok();
+}
+
+glcr::Status Basic::ParseFromBytes(const yunq::MessageView& message, const glcr::CapBuffer& caps) {
+  RETURN_ERROR(ParseFromBytesInternal(message));
+  return glcr::Status::Ok();
+}
+
+glcr::Status Basic::ParseFromBytesInternal(const yunq::MessageView& message) {
+  RETURN_ERROR(message.CheckHeader());
+  // Parse field.
+  ASSIGN_OR_RETURN(field_, message.ReadField<uint64_t>(0));
+
+  return glcr::Status::Ok();
+}
+
+uint64_t Basic::SerializeToBytes(glcr::ByteBuffer& bytes, uint64_t offset) const {
+  yunq::Serializer serializer(bytes, offset, 1);
+  return SerializeInternal(serializer);
+}
+
+uint64_t Basic::SerializeToBytes(glcr::ByteBuffer& bytes, uint64_t offset, glcr::CapBuffer& caps) const {
+  yunq::Serializer serializer(bytes, offset, 1, caps);
+  return SerializeInternal(serializer);
+}
+  
+uint64_t Basic::SerializeInternal(yunq::Serializer& serializer) const {
+  // Write field.
+  serializer.WriteField<uint64_t>(0, field_);
+
+  serializer.WriteHeader();
+
+  return serializer.size();
+}
+
+
+}  // namepace ex

lib/yunq/test/example/example.yunq.h

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+// Generated file - DO NOT MODIFY
+#pragma once
+
+#include <glacier/buffer/byte_buffer.h>
+#include <glacier/buffer/cap_buffer.h>
+#include <glacier/status/status.h>
+#include <glacier/container/vector.h>
+#include <glacier/string/string.h>
+#include <yunq/message_view.h>
+#include <yunq/serialize.h>
+#include <ztypes.h>
+
+
+namespace ex {
+
+class Basic {
+ public:
+  Basic() {}
+  // Delete copy and move until implemented.
+  Basic(const Basic&) = delete;
+  Basic(Basic&&) = default;
+  Basic& operator=(Basic&&) = default;
+
+  [[nodiscard]] glcr::Status ParseFromBytes(const yunq::MessageView& message);
+  [[nodiscard]] glcr::Status ParseFromBytes(const yunq::MessageView& message, const glcr::CapBuffer&);
+  uint64_t SerializeToBytes(glcr::ByteBuffer&, uint64_t offset) const;
+  uint64_t SerializeToBytes(glcr::ByteBuffer&, uint64_t offset, glcr::CapBuffer&) const; 
+
+  const uint64_t& field() const { return field_; }
+  uint64_t& mutable_field() { return field_; }
+  void set_field(const uint64_t& value) { field_ = value; }
+
+ private:
+  uint64_t field_;
+
+  // Parses everything except for caps.
+  glcr::Status ParseFromBytesInternal(const yunq::MessageView& message);
+
+  uint64_t SerializeInternal(yunq::Serializer& serializer) const;
+};
+
+
+}  // namepace ex