[Refactor] Refactor all the GlobalCommandOptions from pointer to value reference

[Zheaoli]

Based on the discussion #1820 (comment)

Signed-off-by: Zheao.Li me@manjusaka.me

[djdongjin]

Overall LGTM, left some minor comments. thanks

[djdongjin]

I suggest we remove this function and use volume.Store (the 2nd one below) directly (we can change volume.Store to accept a globalOptions) (Don't necessarily be part of this PR though)

This adds one unnecessary wrap on volume create:

nerdctl/cmd/nerdctl/volume.go

Lines 47 to 49 in 40d341d

	func getVolumeStore(globalOptions *types.GlobalCommandOptions) (volumestore.VolumeStore, error) {
	return volume.Store(globalOptions.Namespace, globalOptions.DataRoot, globalOptions.Address)
	}

nerdctl/pkg/cmd/volume/volume.go

Lines 26 to 32 in 40d341d

	func Store(ns string, dataRoot string, address string) (volumestore.VolumeStore, error) {
	dataStore, err := clientutil.DataStore(dataRoot, address)
	if err != nil {
	return nil, err
	}
	return volumestore.New(dataStore, ns)
	}

nerdctl/pkg/mountutil/volumestore/volumestore.go

Line 42 in 40d341d

func New(dataStore, ns string) (VolumeStore, error) {

[Zheaoli]

This should be another PR, I will update ASAP

[djdongjin]

LGTM on CI green. thanks

[AkihiroSuda]

Thanks