Obfuscate hardcoded strings with sensitive data

[friofry]

Description

Currently, most hardcoded strings can be extracted from the release binary using a text editor or strings, objdump cmd utils.
We could use a simple encryption mechanism with a hardcoded key (or just XOR).
Or/And, as @igor-sirotin suggested, split the key into several pieces and combine them at runtime.

It would be nice to have a macro for this that can be reused for the tokens we inject into the CI at compile time.

Admittedly, this is a protection against an honest man, and the proper mechanism should be implemented later (asking proxy for an ephemeral key, or something inspired by Waku RLN).

Acceptance criteria

The binary doesn't contain any 3rd party secrets as plaintext
related ticket status-im/status-mobile#21807