feat: refactor valopers to remove r/sys/validators dependency

[D4ryl00]

fixes #3567

[Gno2D2]

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[leohhhn]

Why strAddress string and not just std.Address?

[D4ryl00]

To be able to call this function from gnokey CLI directly, e.g.:
gnokey maketx call -pkgpath "gno.land/r/gnoland/valoper_dao_proposal" -func "MakeProposal" -gas-fee 1000000ugnot -gas-wanted 20000000 -broadcast -chainid "dev" -args "g1jg8mtutu9khhfwc4nxmuhcpftf0pajdhfvsqf5" -remote "tcp://127.0.0.1:26657" test1
and so don't need to create a gno file to create a std.Address object and run it with gnokey maketx run....

Do you think it isn't worth it?

[D4ryl00]

I have the same #3824 when this panic occurs.
The flow is:

• add a new valoper with Active: false to force the panic
• create a GovDAO proposal
• vote to accept this proposal
• execute the proposal to produce the panic

The outcome message doesn't show the panic message.