Feature gate dependencies behind resp. features

Signed-off-by: Marcel Müller <[email protected]>

mqtt-format/Cargo.toml

@@ -12,16 +12,19 @@ categories = ["embedded", "parsing"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [features]
+default = ["mqttv5"]
 yoke = ["dep:yoke"]
 debug = ["winnow/debug"]
+mqttv3 = ["dep:futures", "dep:nom", "dep:nom-supreme"]
+mqttv5 = ["dep:winnow"]
 
 [dependencies]
-futures = "0.3.28"
-nom = "7.1.3"
-nom-supreme = "0.8.0"
+futures = { version = "0.3.28", optional = true }
+nom = { version = "7.1.3", optional = true }
+nom-supreme = { version = "0.8.0", optional = true }
 num_enum = "0.7.2"
 thiserror = "1.0.40"
-winnow = "0.6.5"
+winnow = { version = "0.6.5", optional = true }
 yoke = { version = "0.7.0", features = ["derive"], optional = true }
 
 [dev-dependencies]