Add valid Deposit model and return types of blockchain methods

Co-authored-by: geovanne97 <geovannessaraiva97@gmail.com>

src/model/ValidDeposit.ts

@@ -0,0 +1,10 @@
+import type { BigNumber } from "ethers";
+
+export type ValidDeposit = {
+    depositID: BigNumber;
+    blockNumber: number;
+    remaining: string;
+    seller: string;
+    pixKey: (string | undefined);
+    pixTarget?: string;
+};