chore: better encapsulations in starknet_ibc_apps

cairo-contracts/packages/apps/src/lib.cairo

@@ -1 +1,18 @@
-pub mod transfer;
+pub mod transfer {
+    pub mod components;
+    mod erc20_call;
+    mod errors;
+    pub mod interfaces;
+    pub mod types;
+
+    pub use erc20_call::{ERC20Contract, ERC20ContractTrait};
+    pub use errors::TransferErrors;
+
+    /// The poseidon hash of the transfer port id.
+    pub const TRANSFER_PORT_ID_HASH: felt252 =
+        506076466176013583354797631368330115868609515147080483618120063858966368900;
+
+    pub fn TRANSFER_PORT_ID() -> ByteArray {
+        "transfer"
+    }
+}

cairo-contracts/packages/contracts/src/lib.cairo

@@ -1,11 +1,12 @@
 pub mod core;
 pub mod erc20;
-
 pub mod apps {
-    pub mod transfer;
+    mod transfer;
+    pub use transfer::TransferApp;
 }
 pub mod clients {
-    pub mod cometbft;
+    mod cometbft;
+    pub use cometbft::CometClient;
 }
 mod tests {
     #[cfg(test)]