heap: Add trace configuration to allow hash map placement in external RAM bss section when possible

- Remove the size limit for the hash_map array from the CONFIG_HEAP_TRACE_HASH_MAP_SIZE
- Add test case for heap tracing using hashmap
- Update heap_debug.rst to document the newly added configurations in the heap component

Closes https://github.com/espressif/esp-idf/issues/11172

components/heap/test_apps/heap_tests/pytest_heap.py

@@ -80,7 +80,8 @@ def test_heap_8bit_access(dut: Dut) -> None:
 @pytest.mark.parametrize(
     'config',
     [
-        'heap_trace'
+        'heap_trace',
+        'heap_trace_hashmap'
     ]
 )
 def test_heap_trace_dump(dut: Dut) -> None: