Merge bitcoin/bitcoin#29421: net: make the list of known message types a compile time constant

b3efb48673 protocol: make message types constexpr (Vasil Dimov)
2fa9de06c2 net: make the list of known message types a compile time constant (Vasil Dimov)

Pull request description:

  Turn the `std::vector` to `std::array` because it is cheaper and allows us to have the number of the messages as a compile time constant: `ALL_NET_MESSAGE_TYPES.size()` which can be used in future code to build other `std::array`s with that size.

  ---

  This change is part of https://github.com/bitcoin/bitcoin/pull/29418 but it makes sense on its own and would be good to have it, regardless of the fate of https://github.com/bitcoin/bitcoin/pull/29418. Also, if this is merged, that would reduce the size of https://github.com/bitcoin/bitcoin/pull/29418, thus the current standalone PR.

ACKs for top commit:
  achow101:
    ACK b3efb48673
  jonatack:
    ACK b3efb48673
  maflcko:
    utACK b3efb48673 🎊
  willcl-ark:
    ACK b3efb48673

Tree-SHA512: 6d3860c138c64514ebab13d97ea67893e2d346dfac30a48c3d9bc769a1970407375ea4170afdb522411ced306a14a9af4eede99e964d1fb1ea3efff5d5eb57af

src/test/fuzz/process_message.cpp

@@ -37,7 +37,7 @@ void initialize_process_message()
 {
     if (const auto val{std::getenv("LIMIT_TO_MESSAGE_TYPE")}) {
         LIMIT_TO_MESSAGE_TYPE = val;
-        Assert(std::count(getAllNetMessageTypes().begin(), getAllNetMessageTypes().end(), LIMIT_TO_MESSAGE_TYPE)); // Unknown message type passed
+        Assert(std::count(ALL_NET_MESSAGE_TYPES.begin(), ALL_NET_MESSAGE_TYPES.end(), LIMIT_TO_MESSAGE_TYPE)); // Unknown message type passed
     }
 
     static const auto testing_setup = MakeNoLogFileContext<const TestingSetup>(