Notification filtering based on parameters

[roman-khimov]

Is your feature request related to a problem? Please describe.

I'm always frustrated when we can't filter notifications we subscribe to by parameters. Consider getting events for NEP-17 transfers from some account or to some account, it can't be expressed with filters currently. Consider nspcc-dev/neofs-contract#414 without additional contracts.

Describe the solution you'd like

Add a parameters filter to notification_from_execution. This should be an array (NEP-25 events have an array of parameters) of structures with type and value fields. Types corresponding to NEP-25 (and we can restrict this set to basic (string/hash/int/...) types only to avoid abuse) and values containing type-specific data (smartcontract.Parameter effectively that we accept for invocations). Any type with no value can be used as a placeholder for non-filtered field. Filters containing only Any parameters are not accepted. Number of parameters can be restricted (8? 16?). Then server-side we'd check emitted event not just for name, but for parameters as well.

Describe alternatives you've considered

Keeping things as is, lacking this feature.

Additional context

nspcc-dev/neofs-contract#414
https://github.com/neo-project/proposals/blob/master/nep-17.mediawiki#user-content-Transfer
https://github.com/neo-project/proposals/blob/master/nep-25.mediawiki#user-content-Event
https://pkg.go.dev/github.com/nspcc-dev/[email protected]/pkg/smartcontract#Parameter