test(input): add unit tests for PresenceInput and SubscribeInput

Add unit tests to verify arithmetic operations with list of channels and groups in
`PresenceInput` and `SubscribeInput`.

refactor(cargo): update `Cargo.toml` to include `subscribe` and `presence`

Update `Cargo.toml` to include `subscribe` and `presence` features in `full` and
`default` feature sets.

refactor(dead_code): removed dead code attributes

Cargo.toml

@@ -14,7 +14,7 @@ build = "build.rs"
 [features]
 
 # Enables all non-conflicting features
-full = ["publish", "access", "serde", "reqwest", "aescbc", "parse_token", "blocking", "std", "tokio"]
+full = ["publish", "subscribe", "presence", "access", "serde", "reqwest", "aescbc", "parse_token", "blocking", "std", "tokio"]
 
 # Enables all default features
 default = ["publish", "subscribe", "presence", "serde", "reqwest", "aescbc", "std", "blocking", "tokio"]

src/core/event_engine/cancel.rs

@@ -10,7 +10,7 @@ use crate::{
 };
 
 #[derive(Debug)]
-pub struct CancellationTask {
+pub(crate) struct CancellationTask {
     cancel_rx: Receiver<String>,
     id: String,
 }

src/dx/presence/builders/set_state.rs

@@ -163,7 +163,6 @@ impl<T, D> SetStateRequest<T, D> {
     }
 }
 
-#[allow(dead_code)]
 impl<T, D> SetStateRequestBuilder<T, D>
 where
     T: Transport,