feat: add pathRewriteRule and pathRewriteTo options

[hagevvashi]

This PR enables path-rewriting when proxying by using http-proxy-middleware.

as-is

we cannot proxy below pattern

from http://localhost:8000/api/todos/1 to http://localhost:8001/api/todos/1

to-be

we can proxy below pattern

from http://localhost:8000/api/todos/1 to http://localhost:8001/todos/1

[hagevvashi]

could I remove this?