Migrate Lua filters to built in per route filters

[rudrakhp]

Lua filter has built-in perRoute support, so we won't need to create a seperate lua filter for each route.

I think it's fine to keep the current implmentation as it's a generic approach to support configuration per route. If we find any issues with the multple-filter approach, we can then switch to the built-in perRoute approach.

https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/filters/http/lua/v3/lua.proto#envoy-v3-api-msg-extensions-filters-http-lua-v3-luaperroute

Originally posted by @zhaohuabing in #5171 (review)

[arkodg]

should help reduce listener drain when EEP containing lua is applied/updated