[WIP] perf: filter by ext on chokidar side

[pahan35]

I noticed that nodemon uses a lot of CPU while watching my current project.

I investigated it and found that it is chokidar who consumes lots of resources. I found this issue paulmillr/chokidar#1162.

I looked into the problem through the context of nodemon and found that chokidar watches all the files even if we are interested in files with specific extensions.

So, I made this change paulmillr/chokidar#1274 and proposed it to the chokidar.

If talking in numbers, before that change, I had watched 29 892 files and had usage of CPU. It started from the range 198 - 203 at the beginning and stoped at level 217 - 219 after 5-10 restarts. if retrieved via ps -C node -wwo pid,%cpu,%mem,cmd

After these changes, I started having 20 140 files watched and CPU usage at 173 - 181 at the beginning, which is a noticeable reduction for my system.

@remy and community, if you consider these changes to be a meaningful improvement, please help me get the PR paulmillr/chokidar#1274 merged.

Also, feel free to share your feedback if you see some improvements in the work I did.

Thanks in advance!

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