Revert "Remove disabled option"

This reverts commit 9ec37aa.

Author: stephenberry

include/glaze/trace/trace.hpp

@@ -62,26 +62,37 @@ namespace glz
 
       std::optional<std::chrono::time_point<std::chrono::steady_clock>> t0{}; // the time of the first event
 
+      std::atomic<bool> disabled = false;
       std::mutex mtx{};
 
       template <class... Args>
          requires(sizeof...(Args) <= 1)
       void begin(const std::string_view name, Args&&... args) noexcept
       {
+         if (disabled) {
+            return;
+         }
          duration(name, 'B', std::forward<Args>(args)...);
       }
 
       template <class... Args>
          requires(sizeof...(Args) <= 1)
       void end(const std::string_view name, Args&&... args) noexcept
       {
+         if (disabled) {
+            return;
+         }
          duration(name, 'E', std::forward<Args>(args)...);
       }
 
       template <class... Args>
          requires(sizeof...(Args) <= 1)
       void duration(const std::string_view name, const char phase, Args&&... args) noexcept
       {
+         if (disabled) {
+            return;
+         }
+
          const auto tnow = std::chrono::steady_clock::now();
          trace_event* event{};
          {
@@ -104,20 +115,30 @@ namespace glz
          requires(sizeof...(Args) <= 1)
       void async_begin(const std::string_view name, Args&&... args) noexcept
       {
+         if (disabled) {
+            return;
+         }
          async(name, 'b', std::forward<Args>(args)...);
       }
 
       template <class... Args>
          requires(sizeof...(Args) <= 1)
       void async_end(const std::string_view name, Args&&... args) noexcept
       {
+         if (disabled) {
+            return;
+         }
          async(name, 'e', std::forward<Args>(args)...);
       }
 
       template <class... Args>
          requires(sizeof...(Args) <= 1)
       void async(const std::string_view name, const char phase, Args&&... args) noexcept
       {
+         if (disabled) {
+            return;
+         }
+
          const auto tnow = std::chrono::steady_clock::now();
          trace_event* event{};
          {