Named algebra (part 1)

[mratsim]

This PR does:

1. Move constantine/math/config, in particular constantine/math/config/curves to a new constantine/named folder and corresponding constantine/named/algebra file.
2. Switch import to be absolute path based on project-root instead of relative.

This does not break code that depends on public protocols like BLS signatures, KZG commitments or EVM precompiles.
It will break code that imports internals in constantine/math/config. A followup PR will rename internal methods to reflect expanding Constantine beyond elliptic curves so it is recommended to wait before upgrading.

Rationale

Curve-specific or protocol-specific code should be separated from the generic math folder.

Furthermore, we will likely support and accelerate field arithmetic for STARK proof systems which do not use elliptic curves. The current configuration assumes we use named curves. The file has been renamed to algebra instead of curves to encompass both fields and curves.

A future PR will rename the configuration functions as named curves are used everywhere in the code so just changing path ended up modifying 429 files!

Regarding the switch to absolute path imports, those avoid needing to figure out relative paths when moving files.
They also allow copying of tests or internal files or user code to other locations without having to modify the imports.