Debug component: add free PSRAM sensor (#5334)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

tests/test5.yaml

@@ -28,6 +28,10 @@ ota:
 
 logger:
 
+debug:
+
+psram:
+
 uart:
   - id: uart_1
     tx_pin: 1
@@ -525,6 +529,16 @@ sensor:
     time:
       name: System Time
 
+  - platform: debug
+    free:
+      name: "Heap Free"
+    block:
+      name: "Heap Max Block"
+    loop_time:
+      name: "Loop Time"
+    psram:
+      name: "PSRAM Free"
+
   - platform: vbus
     model: custom
     command: 0x100