[dep] Migrate deprecated protobuf

[georgezgeorgez]

"github.com/golang/protobuf/proto" is deprecated
in favor of "google.golang.org/protobuf/proto"

Most changes are from re-generated proto classes

[georgezgeorgez]

Generated with

protoc -I. --go_out=:. --go_opt=paths=source_relative common/types/protobuf.proto
protoc -I. --go_out=:. --go_opt=paths=source_relative chain/nom/protobuf.proto
protoc -I. --go_out=:. --go_opt=paths=source_relative consensus/storage/election_data.proto
protoc -I. --go_out=:. --go_opt=paths=source_relative consensus/storage/point.proto

[sol-znn]

I can confirm the generated protobuf files match the ones in the PR.
How did you test them?

[georgezgeorgez]

i built the binary and just starting syncing the node
should probably do a more thorough test before merging the upstream PR

[sol-znn]

I'll do some client testing when your testnet is updated