fix(asio): Removes esp_exception and make all examples to use exceptions

The usage of esp_exception header defining the exception handler
prevents users to customize the exception treatment. By removing it
we allow users that want to run without exceptions to customize the
behavior.

components/asio/examples/udp_echo_server/sdkconfig.defaults

@@ -1,4 +1,5 @@
 CONFIG_ESP_MAIN_TASK_STACK_SIZE=8192
+CONFIG_COMPILER_CXX_EXCEPTIONS=y
 
 #
 # Partition Table