Proposal: Remove devnet1/devnet2 feature flags, use separate branches

[nsannn]

Currently in our devnet-2 branch we use rust feature flags to separate devnet1 and devnet2 features, this allows to compile the code for different devnet versions, however I believe that it creates different problems such as:

1. Code duplication
2. Reduced readability - larger amount of rows make the code harder to read
3. In the future it could result in harder maintenance

My proposal - instead of keeping both devnet1 and devnet2 features in same codebase using rust feature flags, separate it to different branches.

[ArtiomTr]

want to upvote this - this should be done ASAP

[nsannn]

Removed all the devnet1 only code and feature flags in pull request: #50

[nsannn]

Closing this issue, since devnet1 feature flags and code are removed in newest devnet-2 branch commit.