Improve the sync.Pool of TokenResult and EntryContext

[louyuting]

Issue Description

Type: feature request

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[louyuting]

@NineSunRD We might need to enhance the sync.Pool usage for TokenResult and EntryContext.
Are you interesting in this issue?

[NineSunRD]

I will try it

[louyuting]

There is a DATA RACE BUG in previous PR: #142.

It caused by using TokenResult after refurbishing.

The detail and fix PR refer to: #149

@NineSunRD

[louyuting]

Refer to #149
I will close this issue,
Any good idea please reach to me.
Thanks.