Add built-in cryptographic constants (e.g. `secp256k1` curve order)

[pcaversaccio]

It would be useful to have certain cryptographic constants as built-in constants:

Example:

• The order of the secp256k1 curve : 0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141
• The order of the secp256r1 curve : 0xffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551

Furthermore, we could add some important BLS constants for example. A good reference/database on these constants can be found here.

[fubuloubu]

New constants and stuff like this would be great for namespacing in the standard library e.g. from crypto.secp256k1 import CURVE_ORDER or something (containing other types and functions like .derive_public_key(Signature) -> PublicKey)

[mozz30-tech]

It would be useful to have certain cryptographic constants as built-in constants:

Example:

• The order of the secp256k1 curve : 0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141
• The order of the secp256r1 curve : 0xffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551

Furthermore, we could add some important BLS constants for example. A good reference/database on these constants can be found here.