Record Wasm trigger executions for auditing

[s8sato]

This is a leftover task from PR #5471. Currently, when a trigger’s executable is implemented in Wasm, its execution is not recorded, and thus cannot be retrieved as part of a CommittedTransaction for auditing purposes.

This functionality should be reintegrated after the upcoming redesign of the smart contract VM.

I could have gone a step further by adding a buffer of executed instructions inside StateTransaction, but since that effort is likely to be wasted by upcoming changes to Wasm, I intend to leave it as a stub for now.

Originally posted by @s8sato in https://github.com/hyperledger-iroha/iroha/pull/5471#discussion_r2182057380