Fix for ESP32 3.x NetworkClient, Client interface

[brentru]

@facchinm @andreagilardoni Hi - this pull request allows this library to be used with the ESP32 board support package 3.x (Arduino ESP32 v3.0 based on ESP-IDF v5.1)by adding two extra connect() definitions into this library's HTTPClient.h to match the updated Client-type interfaces within ESP32, NetworkClient and NetworkSecureClient.

Since the bug only impacts devices running ESP32 on ESP-IDF 5.x or greater, I've provided a macro to detect the ESP-IDF version and a conditional inclusion guard around these two virtual connect() header-only interfaces.

The PR fixes the following compiler error (compiled with ESP Arduino 3.1.0 RC1):

src/wifi/AdafruitIO_ESP32.cpp:26:52: error: invalid new-expression of abstract class type 'HttpClient'
   26 |   _http = new HttpClient(_client, _host, _http_port);
      |                                                    ^
In file included from /Users/brentrubell/Documents/Arduino/libraries/ArduinoHttpClient/src/ArduinoHttpClient.h:8,
                 from /Users/brentrubell/Documents/Arduino/libraries/Adafruit_IO_Arduino/src/AdafruitIO.h:27,
                 from /Users/brentrubell/Documents/Arduino/libraries/Adafruit_IO_Arduino/src/wifi/AdafruitIO_ESP32.h:20:
/Users/brentrubell/Documents/Arduino/libraries/ArduinoHttpClient/src/HttpClient.h:41:7: note:   because the following virtual functions are pure within 'HttpClient':
   41 | class HttpClient : public Client
      |       ^~~~~~~~~~
In file included from /Users/brentrubell/Library/Arduino15/packages/esp32/hardware/esp32/3.1.0-RC1/cores/esp32/Arduino.h:197,
                 from /Users/brentrubell/Documents/Arduino/libraries/Adafruit_IO_Arduino/src/AdafruitIO_Dashboard.h:19,
                 from /Users/brentrubell/Documents/Arduino/libraries/Adafruit_IO_Arduino/src/AdafruitIO.h:19:
/Users/brentrubell/Library/Arduino15/packages/esp32/hardware/esp32/3.1.0-RC1/cores/esp32/Client.h:29:15: note:     'virtual int Client::connect(IPAddress, uint16_t, int32_t)'
   29 |   virtual int connect(IPAddress ip, uint16_t port, int32_t timeout) = 0;
      |               ^~~~~~~
/Users/brentrubell/Library/Arduino15/packages/esp32/hardware/esp32/3.1.0-RC1/cores/esp32/Client.h:31:15: note:     'virtual int Client::connect(const char*, uint16_t, int32_t)'
   31 |   virtual int connect(const char *host, uint16_t port, int32_t timeout) = 0;
      |               ^~~

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[github-actions]

Memory usage change @ 770bc04

Board	flash	%	RAM for global variables	%
arduino:samd:mkr1000	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board	examples/BasicAuthGet flash	%	examples/BasicAuthGet RAM for global variables	%	examples/CustomHeader flash	%	examples/CustomHeader RAM for global variables	%	examples/DweetGet flash	%	examples/DweetGet RAM for global variables	%	examples/DweetPost flash	%	examples/DweetPost RAM for global variables	%	examples/HueBlink flash	%	examples/HueBlink RAM for global variables	%	examples/ParseURL flash	%	examples/ParseURL RAM for global variables	%	examples/PostWithHeaders flash	%	examples/PostWithHeaders RAM for global variables	%	examples/SimpleDelete flash	%	examples/SimpleDelete RAM for global variables	%	examples/SimpleGet flash	%	examples/SimpleGet RAM for global variables	%	examples/SimpleHttpExample flash	%	examples/SimpleHttpExample RAM for global variables	%	examples/SimplePost flash	%	examples/SimplePost RAM for global variables	%	examples/SimplePut flash	%	examples/SimplePut RAM for global variables	%	examples/SimpleWebSocket flash	%	examples/SimpleWebSocket RAM for global variables	%
arduino:samd:mkr1000	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0

Click for full report CSV

Board,examples/BasicAuthGet<br>flash,%,examples/BasicAuthGet<br>RAM for global variables,%,examples/CustomHeader<br>flash,%,examples/CustomHeader<br>RAM for global variables,%,examples/DweetGet<br>flash,%,examples/DweetGet<br>RAM for global variables,%,examples/DweetPost<br>flash,%,examples/DweetPost<br>RAM for global variables,%,examples/HueBlink<br>flash,%,examples/HueBlink<br>RAM for global variables,%,examples/ParseURL<br>flash,%,examples/ParseURL<br>RAM for global variables,%,examples/PostWithHeaders<br>flash,%,examples/PostWithHeaders<br>RAM for global variables,%,examples/SimpleDelete<br>flash,%,examples/SimpleDelete<br>RAM for global variables,%,examples/SimpleGet<br>flash,%,examples/SimpleGet<br>RAM for global variables,%,examples/SimpleHttpExample<br>flash,%,examples/SimpleHttpExample<br>RAM for global variables,%,examples/SimplePost<br>flash,%,examples/SimplePost<br>RAM for global variables,%,examples/SimplePut<br>flash,%,examples/SimplePut<br>RAM for global variables,%,examples/SimpleWebSocket<br>flash,%,examples/SimpleWebSocket<br>RAM for global variables,%
arduino:samd:mkr1000,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0