Add parsing power-of-two of Gi, Mi and so on

[yonesko]

Example: https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/#meaning-of-memory

[2zqa]

The problem with this change would be backwards compatibility, as people will be expecting GB to be 1073741824 bytes and KB to be 1024, etc. I'm not sure how to tackle this yet. For example, a new package could be created or a new Format function could be created (name to be determined, something like FormatSI?) that keeps this in mind.

I'll take a look at the source code soon to see whether it is any trivial to create a PR for this by myself.