put borsh import behind feature flag

Author: DSharifi

sdk/rust/types/src/tappd.rs

@@ -4,11 +4,13 @@ use alloc::{
     vec::Vec,
 };
 use anyhow::{bail, Context as _, Result};
-use borsh::{BorshDeserialize, BorshSerialize};
 use hex::{encode as hex_encode, FromHexError};
 use serde::{Deserialize, Serialize};
 use sha2::Digest;
 
+#[cfg(feature = "borsh")]
+use borsh::{BorshDeserialize, BorshSerialize};
+
 use crate::dstack::EventLog;
 
 const INIT_MR: &str = "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000";