Split Precompile Constants out of Individual Modules

[refcell]

Description

revm-precompile currently places BLS12-381 precompiles behind the blst feature flag. This restricts everything in the bls12_381 module to only std environments. This ticket is to hoist the constants (for example, bls12-381 g1 addition constants) into a module accessible from a no_std environment.

Constants Module Approach

One option to split these out is to move all the constants into a consts.rs module inside bls12_381 that is not behind the blst feature flag.
Then, remove the blst feature flag on the whole bls12_381 module and place it over only the precompiles within the bls12_381 module.

Effectively, from a no_std environment the api would look like:

revm_precompile
- pub mod bls12_381
  - pub mod consts

And from an std environment, the api would look like:

revm_precompile
- pub mod bls12_381
  - pub mod consts;
  - pub fn precompiles()
  - pub mod g1_add
  - pub mod g1_msm
  - pub mod g2_add
  - pub mod g2_msm
  - pub mod map_fp2_to_g2
  - pub mod map_fp_to_g1
  - pub mod msm
  - pub mod pairing

Motivation

Downstream consumers of revm use revm-precompile to accelerate various precompiles for fault proof programs. For example, in kona, the BLS12-381 precompiles are accelerated. Doing so, requires the use of constants like input length, base fees, and precompile addresses that are already defined in revm, but are inaccessible due to kona-client having a strict no_std requirement.

[rakita]

This makes sense

[Ayushdubey86]

Hello, linking this pr here, code is done, getting indentation problem, can someone check this out ! @refcell @rakita

[Ayushdubey86]

whomsoever is free, can they check out this pr!