Rename native_program.rs to instruction_processor_utils.rs

Prefer the term "instruction processor" over "program". Reserve
the term "native" for the loader and shared object it loads.
Compiling an instruction processor to BPF shouldn't imply changing
to a non-native entrypoint.

sdk/src/lib.rs

@@ -4,10 +4,10 @@ pub mod fee_calculator;
 pub mod genesis_block;
 pub mod hash;
 pub mod instruction;
+pub mod instruction_processor_utils;
 pub mod loader_instruction;
 pub mod message;
 pub mod native_loader;
-pub mod native_program;
 pub mod packet;
 pub mod pubkey;
 pub mod rpc_port;