feat(babylonlabs-io-btc-staking-ts): add channel param to protobuf message creation

Add event channel parameter to the BabylonBtcStakingManager method
that creates a protobuf message for BTC delegation.

Issue: BTC-2143

Co-authored-by: llm-git <[email protected]>

Author: OttoAllmendinger

modules/babylonlabs-io-btc-staking-ts/src/staking/manager.ts

@@ -791,6 +791,7 @@ export class BabylonBtcStakingManager {
 
   /**
    * Creates a protobuf message for the BTC delegation.
+   * @param channel - The event channel to emit the message on.
    * @param stakingInstance - The staking instance.
    * @param stakingInput - The staking inputs.
    * @param stakingTx - The staking transaction.