feature: Added user callback for esp_https_server

- Can be used to get connection or client information (SSL context)
- E.g. Client certificate, Socket FD, Connection state, etc.
- Added example callback for getting client certificate information in 'https_server/simple' example

Closes https://github.com/espressif/esp-idf/issues/7479

examples/protocols/https_server/simple/main/Kconfig.projbuild

@@ -0,0 +1,10 @@
+menu "Example Configuration"
+
+    config EXAMPLE_ENABLE_HTTPS_USER_CALLBACK
+        bool "Enable user callback with HTTPS Server"
+        default false
+        help
+            Enable user callback for esp_https_server which can be used to get SSL context (connection information)
+            E.g. Certificate of the connected client
+
+endmenu