Fastparquet. adds fastparquet and the cramjam backend.

In progress (both build on my machine, untested so far)
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name: Code improvement
about: Suggest a code improvement, i.e. refactoring, deprecation, etc.
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---
name: Code improvement
about: Suggest a code improvement, i.e. refactoring, deprecation, etc.
title: ""
labels:
assignees: ""
---

## Proposed refactoring or deprecation

<!-- A clear and concise description of the code improvement -->

### Motivation

<!-- Please outline the motivation for the proposal. If this is related to another GitHub issue, please link here too -->

### Pitch

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### Additional context

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