Support Tiering for Skytable

Introduction

Skytable is written in C and Rust, together requiring several build tools and dependencies. Also, our CI test suite is limited to a number of runner platforms (inclusive of OSes and/or architectures). This situation demands us to define an official "support level" or "tiering" for these platforms.

Support levels (tiers)

	Tier 1 (T1) (full support)	Tier 2 (T2) (known to build but not shipped)	Tier 3 (T3) (untested)	Tier 4 (T4) (unsupported)
Known to compile on this platform	✔️	✔️	✔️	❌
The entire test suite has been successfully run on this platform	✔️	✔️	❌	❌
The test-suite is run on every commit by our CI	✔️	❌	❌	❌
Native binaries are shipped by us	✔️	❌	❌	❌
Build tools are natively shipped for this platform in a similar support-level	✔️	❌	❌	❌
Architectures	- GNU/Linux (aarch64/x86_64/i686) - macOS (x86_64) - Windows (x86_64/i686)	- macOS (arm64v8) [see #127] - Linux MUSL (x86_64) [see #136]	—	—

⚠️This list may be outdated; if it is, please open an issue; thank you!