refactor: unify time handling by introducing a time module with jiff and chrono support

[asmh1989]

add chrono support #154

[tisonkun]

What layout or appender do you use now?

I'm considering, instead of mergeing this polyfill patch, started to factor out the core APIs and concrete impls. So that you can depend on the API and exact impls as you wish. When you don't like the impls that depends on jiff, you can write your own, or copy the code and replace the jiff deps. Then you can still use the other APIs/components that doesn't depend on jiff.

[asmh1989]

我现在是用到了 append-rolling-file, 您考虑的更多吧, 我这样改, 能最快满足我个人的需求, 还有还是希望开箱即用吧, 能features搞定的不要写代码

[tisonkun]

嗯，我可能需要多点时间想想。这样改就 OK 的话，你可以考虑用 cargo patch 的能力切到你的分支上：

• https://doc.rust-lang.org/cargo/reference/overriding-dependencies.html#the-patch-section

开箱即用的话，看看我九月份能不能有时间把模块拆分和 rolling file appender 另外几个 issue 一并看下。如果拆分完了，单独做一个依赖 chrono 的 crate 我看看合不合理。主要还是 chrono 和 jiff 的接口本来出入就比较大，强行缝合在一起，你说再来一个人说还要支持 time，合理不合理呢（x）

把这个事情缝合好本身都可以做一个通用的 datetime 抽象，对接不同的实现了😇

[asmh1989]

好, 那我先用自己分支, 后续实现了记得通知下我

[tisonkun]

Closed as won't fix, at least for now. See #169 (comment).