Proposal: log binary data for Solidity

The program_id is not needed on "Program return data: " because it
always preceeded by the program invoke message, so no need to repeat
the program id. Also rename this to "Program return: " since "data"
is redundant.

sdk/program/Cargo.toml

@@ -36,10 +36,12 @@ thiserror = "1.0"
 
 [target.'cfg(not(target_arch = "bpf"))'.dependencies]
 bitflags = "1.3.1"
+base64 = "0.13"
 curve25519-dalek = "3.0.0"
 libsecp256k1 = "0.6.0"
 rand = "0.7.0"
 solana-logger = { path = "../../logger", version = "=1.8.0" }
+itertools = "0.10.1"
 
 [dev-dependencies]
 static_assertions = "1.1.0"