Use deno cache itself rather than create a redundant second one

[caramboleyo]

Hello,

in this issue i suggested a Deno.fromCache function, they told me to try here.

Problem is, that this cache extension creates its own folder inside DENO_DIR not using the original cache and only works with a lot of extra permissions.

I think getting real cache data will only work if it is provided by the deno rust stuff under the hood.