mir: use multiple goroutine to accelerate parser/generator process

[alimy]

• mir: use multiple goroutine to accelerate parser/generator proecess

[alimy]

• support pass RunMode options item to set run mode, can set InSerialMode/InSerialDebugMode/InConcurrentMode/InConcurrentDebugMode defualt is InSerialMode now.
• set RunMode as InConcurrentMode or InConcurrentDebugMode will use multiple goroutine to accelerate parser/generator process.

eg:

//go:generate go run main.go
func main() {
    log.Println("generate code start")
    entries := mirEntries()
    opts := &core.Options{
        RunMode: core.InConcurrentDebugMode,
        GeneratorName: core.GeneratorGin,
        GeneratorOpts: core.InitOpts{
            core.OptSinkPath: "./gen",
        },
    }
    if err := engine.Generate(entries, opts); err != nil {
        log.Fatal(err)
    }
    log.Println("generate code finish")
}