fix(tabbar): remove color property add new css variable

[LeeJim]

🤔 这个 PR 的性质是？

• 新特性提交
• 演示代码改进

🔗 相关 Issue

fix #645

💡 需求背景和解决方案

统一使用 CSS Variable 调整样式相关；移除 color 属性

📝 更新日志

• fix(Tabbar): 移除 color 属性，使用 CSS Variable 替代
• feat(Tabbar): 新增 CSS Variable 调整标签栏字体和图标颜色，具体查看文档
• docs(Tabbar): 新增自定义主题示例代码

[github-actions]

Size Change: -99 B (0%)

Total Size: 145 kB

Filename	Size	Change
./miniprogram_dist/tab-bar/props.js	204 B	-42 B (-17%)	👏
./miniprogram_dist/tab-bar/tab-bar-item.js	1.02 kB	-39 B (-4%)
./miniprogram_dist/tab-bar/tab-bar-item.wxml	524 B	-22 B (-4%)
./miniprogram_dist/tab-bar/tab-bar.js	925 B	+1 B (0%)
./miniprogram_dist/tab-bar/tab-bar.wxml	139 B	+3 B (+2%)

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