Reduce external dependencies

Investigate the possibility to replace following libraries:

[BrotliSharpLib](https://www.nuget.org/packages/BrotliSharpLib/) (>= 0.3.3)
[FastMember](https://www.nuget.org/packages/FastMember/) (>= 1.5.0)
[IronSnappy](https://www.nuget.org/packages/IronSnappy/) (>= 1.3.1)
[Newtonsoft.Json](https://www.nuget.org/packages/Newtonsoft.Json/) (>= 13.0.2)

with native/up-to-date versions.