feat(comp:alert): add theme tokens for typed alert text and bg colors

[sallerli1]

1. add typed alert theme tokens
2. change warining typed alert text and bg color to bronze and gold

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

alert 的 warning 类型的文字和背景颜色不正确

What is the new behavior?

1. 新增 alert 的文字和背景颜色相关主题token
2. 修改 warning 类型的文字颜色为 bronze d10，背景颜色为 gold base

Other information

[idux-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.77%. Comparing base (1946e26) to head (814f4a7).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1918   +/-   ##
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  Coverage   90.77%   90.77%           
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  Files         360      360           
  Lines       35443    35443           
  Branches     2832     2832           
=======================================
  Hits        32175    32175           
  Misses       3268     3268           

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