Validate any spawned commit transaction prior adding them to the wallet

[frolosofsky]

As has been described in the #996 (comment), node could keep invalid spawned finalizer commit transactions in the wallet because there's a lack of validation of them prior adding to the wallet.

This could be fixed in a similar way as #1040 does it for deposit transactions. @kostyantyn also came with a proposal to use ContextualCheck: #1040 (comment). 3rd option is to apply the full transaction validation path.

User-driven commits (definitely must be fixed):

• deposit Validate deposit prior adding to the wallet #1040
• logout
• withdraw
• admin

System-driven commits (needs more investigation):

• vote
• slash