Feature/gateway inbuilt nr (#3877)

* changed NymConfigTemplate trait to call 'template' by reference

* network requester lib

* introduced generic parameter to 'MixTrafficController' to allow non-remote gateways

* allowing for custom gateway sender

* types cleanup

* minor gateway cmds refactor + initial NR work

* wip

* running a NR inside gateway

note: this NR isnt tied to the gateway yet

* rebase fixes

* propagating same shutdown handle

* wip

* starting NR with appropriate local transceiver

* fixed premature shutdown

* wiring up PacketRouter

* both ends wired together

* actually working

so much cleanup to do now

* started removing dead code

* wip

* temp: hardcode gateway

* further cleanup

* fixed build of other binaries

* setup-network-requester subcmd

* overriding NR config in gateway init/run

* wip making it wasm-compatible [again]

* refactored 'GatewaySetup'

* clippy and friends

* removed debug code

* rust 1.72 lints

* ensuring local gateway is available + some comments

* correctly putting network requester data in the same underlying details struct

* improved gateway errors

* changed 'network_requester_config' deserialization

* missing clap annotation for 'enabled' flag in 'setup-network-requester' command

* saving config file after 'setup-network-requester'

* removed dead code

* review comments

* make embedded NR wait for gateway to come online (for at most 70min)

* fixed shutdown on successful gateway wait

* updated NR config override

mixnode/src/config/mod.rs

@@ -88,7 +88,7 @@ pub struct Config {
 }
 
 impl NymConfigTemplate for Config {
-    fn template() -> &'static str {
+    fn template(&self) -> &'static str {
         CONFIG_TEMPLATE
     }
 }