[lib] introduce stateless olm API

Summary:
The point of this code is to introduce stateless olm interface shared across all platforms:

• on native we have CryptoModule which takes care of each action and persists state
• on web there is ongoing @michal's work to achieve the same (project).

This will allow us to:

• use olm API from /lib (we can also expand it to /keyserver)
• move code like peerToPeerMessageHandler to /lib
• completely move taking care of state/transactions/atomicity to a different place and from a business logic perspective only call methods

Right now, on web it will cause some code duplication with OlmSessionCreatorContext, but after ENG-6462 this context won't have any state and we can remove it and just use this API.

This also helps @michal to implement moving responsibility to worker - right now app still works with context and when everything is ready we can just "flip-the-switch" to use this API.

This approach was discussed with @michal, @tomek, and @marcin.

Depends on D11110

Test Plan: Tested encrypt/decrypt methods on web with properly generated accounts/sessions.

Reviewers: marcin, varun, tomek, michal

Reviewed By: tomek, michal

Subscribers: inka, ashoat, tomek, marcin, michal

Differential Revision: https://phab.comm.dev/D11111