Add get_minimum_balance_for_rent_excemption to Client (#14048) (#14052)

(cherry picked from commit 7abd8084b6)

Co-authored-by: Jack May <jack@solana.com>

sdk/src/client.rs

@@ -78,6 +78,8 @@ pub trait SyncClient {
         commitment_config: CommitmentConfig,
     ) -> Result<u64>;
 
+    fn get_minimum_balance_for_rent_exemption(&self, data_len: usize) -> Result<u64>;
+
     /// Get recent blockhash
     fn get_recent_blockhash(&self) -> Result<(Hash, FeeCalculator)>;