caddy version: v2.7.0-beta.1

As a result of #5521 running caddy per caddy run --watch

1. the log gets very spammy. Every second, there is a line like this:

   2023/05/17 12:46:42.285	INFO	using provided configuration	{"config_file": "Caddyfile", "config_adapter": ""}
   2023/05/17 12:46:43.291	INFO	using provided configuration	{"config_file": "Caddyfile", "config_adapter": ""}
   2023/05/17 12:46:44.287	INFO	using provided configuration	{"config_file": "Caddyfile", "config_adapter": ""}
   

2. Even relatively easy Caddyfiles are not always byte-equal after loading, which is why it is reloaded very often even though there are no changes. This line is the culprit https://github.com/caddyserver/caddy/blob/v2.7.0-beta.1/cmd/main.go#L224
   Example Caddyfile:

   {
   	log {
   		format console {
   			time_format wall_milli
   			time_local
   			level_format upper
   		}
   	}
   }
   
   (config) {
   	root .
   	file_server browse
   }
   
   http://:80 {
   	import config
   }
   
   :443 {
   	tls internal
   	import config
   }
   

   lastCfg contents:

   {"logging":{"logs":{"default":{"encoder":{"format":"console","level_format":"upper","time_format":"wall_milli","time_local":true}}}},"apps":{"http":{"servers":{"srv0":{"listen":[":443"],"routes":[{"handle":[{"handler":"vars","root":"."},{"browse":{},"handler":"file_server","hide":[".\\Caddyfile",".\\Caddyfile:22 (import config)"]}]}]},"srv1":{"listen":[":80"],"routes":[{"handle":[{"handler":"vars","root":"."},{"browse":{},"handler":"file_server","hide":[".\\Caddyfile:17 (import config)"]}]}]}}},"tls":{"automation":{"policies":[{"issuers":[{"module":"internal"}]}]}}}}

   newCfg contents:

   {"logging":{"logs":{"default":{"encoder":{"format":"console","level_format":"upper","time_format":"wall_milli","time_local":true}}}},"apps":{"http":{"servers":{"srv0":{"listen":[":443"],"routes":[{"handle":[{"handler":"vars","root":"."},{"browse":{},"handler":"file_server","hide":[".\\Caddyfile:22 (import config)",".\\Caddyfile"]}]}]},"srv1":{"listen":[":80"],"routes":[{"handle":[{"handler":"vars","root":"."},{"browse":{},"handler":"file_server","hide":[".\\Caddyfile:17 (import config)"]}]}]}}},"tls":{"automation":{"policies":[{"issuers":[{"module":"internal"}]}]}}}}

   The difference is in file_servers hide field. The json array does not always seems to have the same order.

I don't really like the changes in #5521. Rereading the config every second is very inefficient. Isn't there a more efficient way like keeping track of all modification times of imported config files and the Caddyfile itself or using filesystem watchers (e.g https://github.com/fsnotify/fsnotify)?