Cache control

[dblodgett-usgs]

User story

As a user of a package that calls pizzarr, I want the ability to control pizzarr caching using environment variables and/or a high-level cache-control function.

Preferred solution

Environment variables to modify how memoise caches results should be set up and used and a stand along pizzarr::http_cache_control() function should be added that will modify active caches without access to the actual store object.

Possible alternatives