Crypto4: Refactor cryptographic core

[hvge]

Description

Due to a variability of Crypto4 protocol, we need to refactor multiple internal components of PowerAuthCore module, written in C++. Internally, Session object should no longer implement all heavy protocol stuff, such as authorization code calculation. We should offload this to separate interfaces and specific implementations, depending on the protocol version and selected algorithms.

The best example is SharedSecret interface that defines algorithm independent process for a for key-agreement.

Acceptance criteria

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Technical specification

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QA specification

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JIRA issue code

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[hvge]

It would be nice to use this new approach also for SDK v 1.10.0. So, we should refactor the core first, then implement interfaces with protocol V3.3 and after that we should build crypto4 on top of this foundation.