add unit tests on coin spending edge cases

[Leo-Besancon]

• List all coin spending cases (all op types, during sc creation)
• Test each one

execution.rs

• Fee debit
• Roll Buy
• exec transaction op
• exec call sc op
• exec async message
• Credit creator of the endorsement
• credit creator of the endorsed block
• credit block creator with remaining_credit
• transfert fee (read only bytecode)
• transfert fee (read only function call)
• transfert coins (read only function call)

context.rs

• cancel_async_message
• execute_deferred_credits

interface_impl.rs

• init_call transfer coins from caller to target
• transfer_coins /// [DeprecatedByNewRuntime] Replaced by transfer_coins_wasmv1
• transfer_coins_for //Transfer coins from a given address towards a target address.
• transfer_coins_wasmv1 // Transfer coins from a given address (or the current address if not specified) towards a target address.
• send_message coins + fee //asynchronous message to the context speculative asynchronous pool
• init_call_wasmv1 //transfer coins from caller to target address

speculative_ledger.rs

• transfer_coins
• create_new_sc_address
• set_bytecode
• charge_datastore_entry_change_storage