chore: rename command name from "cmd" to "gorched"

[xiaoxiangmoe]

mkdir dist

# generate bin ./dist/cmd
go build -o ./dist ./cmd
# generate bin ./dist/gorched
go build -o ./dist ./cmd/gorched

This also affects commands like go install and so on.

We need follow go project structure's ./cmd directory standard to generate bin with correct name.

[xiaoxiangmoe]

@zladovan friendly ping

[xiaoxiangmoe]

@zladovan friendly ping