chore: add issues templates and config (#94)

Co-authored-by: Shigma <shigma10826@gmail.com>

.github/ISSUE_TEMPLATE/bug-report.yaml

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+name: Bug Report
+description: 提交错误报告
+title: "Bug: "
+labels:
+  - bug
+body:
+  - type: textarea
+    attributes:
+      label: Describe the bug
+      description: 请简明地表述 bug 是什么。
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Steps to reproduce
+      description: 请描述如何重现这个行为。
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Expected behavior
+      description: 请描述期望的行为。
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Screenshots
+      description: 请尽量详细地提供相关截图，可以是聊天记录、Koishi 日志和服务端 (如 go-cqhttp) 日志等。文本的日志请复制到下方文本框。
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: 请将日志输出复制到此处。这个文本框的内容会自动渲染为代码，因此你不需要添加反引号 (`)。
+      render: shell
+  - type: dropdown
+    id: launcher
+    attributes:
+      label: Launcher
+      description: 启动 Koishi 的方式
+      options:
+        - Koishi Desktop
+        - Koishi Android
+        - Koishi CLI (koishi start)
+        - Containers (Docker, Kubernates, etc)
+        - Manually (node index.js)
+    validations:
+      required: true
+  - type: dropdown
+    id: backend
+    attributes:
+      label: Backend
+      description: 服务类型及登录方式
+      options:
+        - NovelAI (帐号密码)
+        - NovelAI (Token)
+        - NAIFU
+        - Stable Diffusion WebUI (AUTOMATIC1111)
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Versions
+      description: 请填写相应的版本号。
+      value: |
+        - OS: <!-- e.g. Windows 10 -->
+        - Adapter: <!-- e.g. Discord -->
+        - Node version: <!-- e.g. 18.12.0 -->
+        - Koishi version: <!-- e.g. 4.9.9 -->
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: 请描述其他想要补充的信息。

.github/ISSUE_TEMPLATE/config.yaml

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+blank_issues_enabled: true
+contact_links:
+  - name: Discussions
+    url: https://github.com/koishijs/novelai-bot/discussions
+    about: 相关话题、分享想法、询问问题，尽情地在讨论中灌水！

.github/ISSUE_TEMPLATE/feature-request.yaml

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+name: Feature Request
+description: 提交功能请求
+title: "Feature: "
+labels:
+  - feature
+body:
+  - type: dropdown
+    id: scope
+    attributes:
+      label: Scope
+      description: 该特性适用的后端
+      multiple: true
+      options:
+        - NovelAI
+        - NAIFU
+        - Stable Diffusion WebUI (AUTOMATIC1111)
+        - Others
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Describe the problem related to the feature request
+      description: 请简要地说明是什么问题导致你想要一个新特性。
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Describe the solution you'd like
+      description: 请说明你希望使用什么样的方法 (比如增加什么功能) 解决上述问题。
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Describe alternatives you've considered
+      description: 除了上述方法以外，你还考虑过哪些其他的实现方式？
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: 请描述其他想要补充的信息。