✨ 增加 Metric 服务

[suyiiyii]

resolve #105
close #661

当前 Grafana 效果图

面板：https://gist.github.com/suyiiyii/c8c1864c82ba69a2f6065f07d9db81fc

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[codecov]

Codecov Report

Attention: Patch coverage is 78.26087% with 10 lines in your changes missing coverage. Please review.

Project coverage is 85.28%. Comparing base (f35c6c2) to head (10fc200).

Files with missing lines	Patch %	Lines
nonebot_bison/scheduler/scheduler.py	68.75%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #666      +/-   ##
==========================================
+ Coverage   85.24%   85.28%   +0.04%     
==========================================
  Files          97       98       +1     
  Lines        5490     5519      +29     
==========================================
+ Hits         4680     4707      +27     
- Misses        810      812       +2     

Flag	Coverage Δ
smoke-test	85.28% <78.26%> (+0.04%)	⬆️

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[AzideCupric]

是不是得补充一点用户使用文档
怎么打开和接入之类的

[suyiiyii]

别急（
不合进去都不好写 compose.yaml
不过，会用 Prometheus 和 Grafana 的，也不需要教吧（
晚点再起一个 pr 写文档和 compose.yaml 吧

[AzideCupric]

会用 Prometheus 和 Grafana 的，也不需要教吧（

倒也不用写很细致，就是让用户知道这回事和介绍一下基本的接入方式就行

晚点再起一个 pr 写文档和 compose.yaml 吧

文档放一起吧 没必要另起pr

[suyiiyii]

倒也不用写很细致，就是让用户知道这回事和介绍一下基本的接入方式就行
文档放一起吧 没必要另起pr

done

compose.yaml 也写好了，不需要另起 pr 了