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.

programs/bpf/Cargo.toml

@@ -52,6 +52,7 @@ members = [
     "rust/deprecated_loader",
     "rust/dup_accounts",
     "rust/error_handling",
+    "rust/log_data",
     "rust/external_spend",
     "rust/finalize",
     "rust/instruction_introspection",