token limit support context

[sado0823]

supported token limiter with context using option func mode, if not set, using context.backgroud as default

        // example
        s, err := miniredis.Run()
	assert.Nil(t, err)

        l := NewTokenLimiter(rate, burst, redis.New(s.Addr()), "tokenlimit")
	defer s.Close()
        
        // use cuxtom ctx
	ctx, cancel := context.WithCancel(context.Background())
	ok := l.Allow(WithTokenCtx(ctx))
	assert.True(t, ok)

[sado0823]

@kevwan

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

---

@kevwan

[kevwan]

Recommend to use AllowCtx(ctx), and AllowNCtx(ctx...).

[sado0823]

try with AllowCtx(ctx), and AllowNCtx(ctx...), please review it. @kevwan