supply helpers and examples to support ink contracts

[brenzi]

write helper functions for deploying and interacting with ink contracts. Write an example for the flipper contract as shown here with Polkadot.js API:

https://substrate.dev/docs/en/contracts/deploying-a-contract

write helpers for

• put_code()
• create()
• call()

This will include parsing a contract's ABI and give some debugging advice with graceful error handling

Hints: Done that before:

• https://github.com/scs/substraTEE-worker/blob/bbdacb37fb437be962cf9cc3eb2704e3add82a5f/enclave/src/lib.rs#L459
• https://github.com/scs/substraTEE-worker/blob/bbdacb37fb437be962cf9cc3eb2704e3add82a5f/enclave/src/lib.rs#L517
• https://github.com/scs/substraTEE-worker/blob/bbdacb37fb437be962cf9cc3eb2704e3add82a5f/enclave/src/lib.rs#L592