Prepare SDK for trimming feature

[OlegRa]

The upcoming .NET 7 SDK will use the trimming feature more aggressively so we should prepare for this and maintain trimmable SDK as much as possible. This article contains a lot of useful information about diagnosing problems related to trimming.

[OlegRa]

The main roadblock for proper trimming support is a Newtonsoft.Json package. We should return to this issue after implementing the epic #145 feature.