Switch the source-of-truth to Wasmtime (#140)

* Switch the source-of-truth to Wasmtime

This commit is a follow-up to the merging of the Wizer repository
into Wasmtime. At this time I don't have plans for what to do about the
npm package or the old `wizer` CLI, so I've updated this repository
in-place to use the Wasmtime repository upstream. I figure that if other
folks are interested to maintain this then this is a reasonable-enough
starting point and can take it from here. In this commit I deleted all
the benchmarks but kept the tests running.

* Remove fuzzing infrastructure

Bump to version 10.0.0 (#137)

Bump to version 9.0.0 (#135)

Bump to version 8

update ci write permissions (#120)

7.0.4 (#117)

7.0.3 (#115)

Bump to 7.0.2 (#113)

Bump to 7.0.1 (#111)

Bump to version 7.0.0 (#110)