add simdjson ports for comparison. leave out mere bindings (for now)

[matu3ba]

https://github.com/simdjson/simdjson#bindings-and-ports-of-simdjson

• https://github.com/simd-lite/simd-json
• https://github.com/minio/simdjson-go
• https://github.com/EgorBo/SimdJsonSharp

And the very WIP https://github.com/travisstaloch/simdjzon

Is there a policy to use releases only or that there must be (stable) releases?

[nuald]

We don't have that policy, especially with libraries (all tests are using the cutting edge versions except Boost as it's too slow to clone and build).