feat(esp_trace): add compiler-instrumented function tracing support

tools/esp_app_trace/test/sysview/expected_output

@@ -3737,3 +3737,5 @@ Processed 99 heap events.
 /Users/erhan/dev/esp-idf/components/freertos/FreeRTOS-Kernel/portable/xtensa/port.c:141
 
 Found 17706 leaked bytes in 45 blocks.
+=============== FUNCTION TRACE REPORT ===============
+Processed 0 function trace events.

tools/esp_app_trace/test/sysview/expected_output.json

@@ -26180,6 +26180,10 @@
         }
     ],
     "streams": {
+        "func": {
+            "enter": 0,
+            "exit": 1
+        },
         "heap": {
             "alloc": 512,
             "free": 513

tools/esp_app_trace/test/sysview/expected_output_mcore

@@ -3748,3 +3748,5 @@ Processed 99 heap events.
 /Users/erhan/dev/esp-idf/components/freertos/FreeRTOS-Kernel/portable/xtensa/port.c:141
 
 Found 17706 leaked bytes in 45 blocks.
+=============== FUNCTION TRACE REPORT ===============
+Processed 0 function trace events.

tools/esp_app_trace/test/sysview/expected_output_mcore.json

@@ -26268,6 +26268,10 @@
         }
     ],
     "streams": {
+        "func": {
+            "enter": 0,
+            "exit": 1
+        },
         "heap": {
             "alloc": 512,
             "free": 513