[Feature] 支持 Clash.Meta rule-anchor 配置方式

[steveqx]

Verify steps

• 我已经在 Issue Tracker 中找过我要提出的问题 I have searched on the issue tracker for a related issue.
• 我已经使用公测版本测试过，问题依旧存在 I have tested using the test mod, and the issue still exists.
• 我已经仔细看过 常见问题 并无法自行解决问题

Description

Clash.meta 的 rule-anchor 可以方便简化重复性的配置

Config Example
rule-anchor:
ip: &ip {type: http, interval: 86400, behavior: ipcidr, format: mrs}
domain: &domain {type: http, interval: 86400, behavior: domain, format: mrs}
rule-providers:
private_domain:
<<: *domain
url: "https://raw.githubusercontent.com/MetaCubeX/meta-rules-dat/meta/geo/geosite/private.mrs"
cn_domain:
<<: *domain
url: "https://raw.githubusercontent.com/MetaCubeX/meta-rules-dat/meta/geo/geosite/cn.mrs"
biliintl_domain:

希望添加 rule-anchor
scripts/start.sh Line 441

yaml_char='proxies proxy-groups proxy-providers rules rule-providers'
改为
yaml_char='proxies proxy-groups proxy-providers rules rule-anchor rule-providers'