Enhancements for global.fetch

[mjackson]

A few small enhancements I'd like to make to the global.fetch we provide in node:

• Use { compress: false } by default. This lets people more easily return the result of a fetch directly from a data loader with the proper encoding.
• Use the .cache/fetch directory by default for caching fetch results. In a long-running server process, this can really speed up the results of a fetch.

[tikotzky]

The cache backend should probably be configurable like https://github.com/npm/make-fetch-happen#--optscachemanager

This would help when deploying to a serverless environment where the filesystem will likely not be shared across requests.

[mjackson]

Yep, agree 100% @tikotzky. I'm thinking we can add a config.cache option to remix.config.js that works like make-fetch-happen's cacheManager option.

[mjackson]

FWIW I included a disk-based cache by default in v0.6.0 but had to roll it back in v0.6.1 because 304's weren't being handled properly (returning null for the data in loaders). Still need to investigate further.

[ryanflorence]

#8 (comment)