fixup! coap: Implement traits independently of feature flag

Cargo.toml

@@ -35,14 +35,14 @@ rand_core_06 = { package = "rand_core", version = "^0.6" }
 # For nimble UUID parsing and some debug implementations
 hex = { version = "^0.4.3", default-features = false }
 
-coap-numbers = { version = "^0.2.0", optional = true }
+coap-numbers = "^0.2.0"
 
 embedded-graphics = "0.6"
 
 # Originally disabled by default because they were not published yet; now
 # disabled by default we're moving toward opt-in modules anyway.
-coap-message = { version = "^0.2.3", optional = true }
-coap-handler = { version = "^0.1.4", optional = true }
+coap-message = "^0.2.3"
+coap-handler = "^0.1.4"
 embedded-nal = { version = "0.6.0", optional = true }
 embedded-nal-tcpextensions = { version = "0.1", optional = true }
 pin-utils = "0.1"