Utilities for input.json file

[ksolana]

input.json file has a very fixed set of things to add to, but it is often difficult to generate a working file. The most painful part being the instruction_data field.

• A way to generate instruction_data bytes by using the textual representation. It can be built on top of binascii
• Generate other fields like accounts, program_id
• Verify if input.json file is correct for a binary. (check for entry points etc.) See A utility to print all the entry points of a binary #56

[github-actions]

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