Prep work for better Store and Forward (#8999)

* make channels.h getHash public

* router.* make the encrypted packet copy available for modules to access

* Update src/mesh/Router.h

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Set p_encrypted to nullptr after release

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/mesh/Channels.h

@@ -96,6 +96,8 @@ class Channels
 
     bool setDefaultPresetCryptoForHash(ChannelHash channelHash);
 
+    int16_t getHash(ChannelIndex i) { return hashes[i]; }
+
   private:
     /** Given a channel index, change to use the crypto key specified by that index
      *
@@ -113,8 +115,6 @@ class Channels
      */
     int16_t generateHash(ChannelIndex channelNum);
 
-    int16_t getHash(ChannelIndex i) { return hashes[i]; }
-
     /**
      * Validate a channel, fixing any errors as needed
      */