Add `Proposal.transactionCount`

backend-lib/src/main/java/cash/z/ecc/android/sdk/internal/model/ProposalUnsafe.kt

@@ -37,6 +37,18 @@ class ProposalUnsafe(
         return inner.toByteArray()
     }
 
+    /**
+     * Returns the number of transactions that this proposal will create.
+     *
+     * This is equal to the number of `TransactionSubmitResult`s that will be returned
+     * from `Synchronizer.createProposedTransactions`.
+     *
+     * Proposals always create at least one transaction.
+     */
+    fun transactionCount(): Int {
+        return inner.stepsCount
+    }
+
     /**
      * Returns the total fee required by this proposal for its transactions.
      */

sdk-lib/src/main/java/cash/z/ecc/android/sdk/model/Proposal.kt

@@ -33,6 +33,18 @@ class Proposal(
         return inner
     }
 
+    /**
+     * Returns the number of transactions that this proposal will create.
+     *
+     * This is equal to the number of `TransactionSubmitResult`s that will be returned
+     * from `Synchronizer.createProposedTransactions`.
+     *
+     * Proposals always create at least one transaction.
+     */
+    fun transactionCount(): Int {
+        return inner.transactionCount()
+    }
+
     /**
      * Returns the total fee required by this proposal for its transactions.
      */