Load script from npm modules in Fetcher

Currently fetcher can only load script with `http` or `https` protocol, but cicada will try to load `@cicada-lang/framework/lib/repl` from npm, thus corrupts `cic` command.

https://github.com/cicada-lang/cicada/commit/424ebda2837d37290e876d6bd09ed30b27867ff4#diff-6fdb9519bc22d78a00ff49db93a8939c9e57a7be3b05338be646869e717e4c00R1