feat: 测试插件是否在 import 前使用 require 声明依赖

[he0119]

加载插件后，require 其依赖来测试是否符合标准。

from nonebot import init, load_plugin, require

init(driver="~none")
valid = load_plugin("nonebot_plugin_xxx")
require("nonebot_plugin_yyy")

if not valid:
    exit(1)
else:
    exit(0)

[codecov]

Codecov Report

Merging #115 (c47021a) into main (f2e8770) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #115   +/-   ##
=======================================
  Coverage   94.10%   94.10%           
=======================================
  Files           6        6           
  Lines         526      526           
=======================================
  Hits          495      495           
  Misses         31       31           

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