Implement --vub-increment option for CLI commands

[AnnaShaleva]

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

User may need to set some custom VUB value for transactions that are constructed via CLI.

Describe the solution you'd like

We need to add a CLI option that allows to override the default VUB transaction value set by txctx:

neo-go/cli/txctx/tx.go

Line 78 in 37d7a3a

tx.ValidUntilBlock += uint32((waitTime.Milliseconds() / int64(ver.Protocol.MillisecondsPerBlock))) + 1

Also, manually-signed transactions may also consider to handle this option:

neo-go/cli/txctx/tx.go

Line 67 in 37d7a3a

tx.ValidUntilBlock += (ver.Protocol.MaxValidUntilBlockIncrement - uint32(ver.Protocol.ValidatorsCount)) - 2

Ref. #3343.