feat: todo things about `envoy Lua API`

[membphis]

• [ ] regex: support regular matching.
  • [ ] Create issue at Envoy, discuss with community
  • [ ] Schedule
  • [ ] Integrated into apisix.core
  • [ ] migrate the plugin from APISIX to Envoy
• [ ] envoy.timer
• [ ] share dict
• [ ] cosocket
• [ ] FFI

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[membphis]

@spacewander @tokers @nic-chen