This commit merges [CraneStation/wasi-common] repo as a subdir of
this repo while preserving **all** of git history. There is an
initiative to pull `wasi-common` into [CraneStation/wasmtime], and
[CraneStation/wasmtime] becoming a monorepo. This came about for
several reasons with a common theme of convenience, namely,
having a monorepo:
1. cleans up the problem of dependencies (as we have seen first
hand with dependabot enabled, it can cause some grief)
2. completely removes the problem of syncing the closely dependent
repos (e.g., updating `wasi-common` with say a bugfix generally
implies creating a "sync" commit for pulling in the changes into
the "parent" repo, in this case, `wasmtime`)
3. mainly for the two reasons above, makes publishing to crates.io
easier
4. hopefully streamlines the process of getting the community
involved in contributing to `wasi-common` as now everything
is one place
[CraneStation/wasi-common]: https://github.com/CraneStation/wasi-common
[CraneStation/wasmtime]: https://github.com/CraneStation/wasmtime
