Fix RP2040 Hash.h conflict with Crypto-no-arduino library

The existing ESP8266 workaround detects when Crypto-no-arduino's Hash.h
is included instead of the framework's Hash library (by checking the
CRYPTO_HASH_h guard) and re-includes the correct one. Extend this to
RP2040/RP2350 platforms which use the same framework Hash library for
sha1().

Also declare Hash as a dependency for the raspberrypi platform in
library.json so PlatformIO resolves it correctly.

Author: bdraco

library.json

@@ -39,7 +39,10 @@
     },
     {
       "name": "Hash",
-      "platforms": "espressif8266"
+      "platforms": [
+        "espressif8266",
+        "raspberrypi"
+      ]
     },
     {
       "owner": "ayushsharma82",

src/AsyncWebSocket.h

@@ -36,7 +36,7 @@
 #include <list>
 #include <memory>
 
-#ifdef ESP8266
+#if defined(ESP8266) || defined(TARGET_RP2040) || defined(TARGET_RP2350) || defined(PICO_RP2040) || defined(PICO_RP2350)
 #include <Hash.h>
 #ifdef CRYPTO_HASH_h  // include Hash.h from espressif framework if the first include was from the crypto library
 #include <../src/Hash.h>