feat(webui): virtual message list

[shigma]

支持虚拟的消息列表。

• 同屏只渲染固定数量的消息，其他消息以 padding 的形式留空
• 存储并估计消息的高度，解决空屏问题
• 修复虚拟列表带来的 quote 点击失效问题
• 实现在适当的时机 scrollToBottom 的行为

[codecov]

Codecov Report

Merging #215 (cef7e96) into develop (b429522) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #215   +/-   ##
========================================
  Coverage    92.34%   92.34%           
========================================
  Files           53       53           
  Lines        10638    10638           
  Branches      2176     2176           
========================================
  Hits          9824     9824           
  Misses         814      814           

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[lgtm-com]

This pull request introduces 11 alerts when merging 06cb17d into cfe3209 - view on LGTM.com

new alerts:

• 11 for Unused variable, import, function or class

[lgtm-com]

This pull request introduces 10 alerts when merging 06cb17d into b429522 - view on LGTM.com

new alerts:

• 10 for Unused variable, import, function or class

[lgtm-com]

This pull request introduces 10 alerts when merging 5267a8a into b429522 - view on LGTM.com

new alerts:

• 10 for Unused variable, import, function or class