feat: Add maxAlloc to memory information (#1152)

## Summary

* **What is the goal of this PR?** During debugging of #1092 i
desperately needed to monitor the biggest allocatable block of memory on
the heap
* **What changes are included?** Added informaqtion to debug output,
amended monitor utility to pick it up

## Additional Context

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### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**NO**_

src/main.cpp

@@ -378,8 +378,8 @@ void loop() {
   renderer.setFadingFix(SETTINGS.fadingFix);
 
   if (Serial && millis() - lastMemPrint >= 10000) {
-    LOG_INF("MEM", "Free: %d bytes, Total: %d bytes, Min Free: %d bytes", ESP.getFreeHeap(), ESP.getHeapSize(),
-            ESP.getMinFreeHeap());
+    LOG_INF("MEM", "Free: %d bytes, Total: %d bytes, Min Free: %d bytes, MaxAlloc: %d bytes", ESP.getFreeHeap(),
+            ESP.getHeapSize(), ESP.getMinFreeHeap(), ESP.getMaxAllocHeap());
     lastMemPrint = millis();
   }