Renaming crypto algorithms

[amika-sq]

Here we go again :P

This PR changes names only, and doesn't modify any functionality. The name changes required file name changes, which is why Github is having a really difficult time with the diff here.

This PR does the below renames, as we discussed in our weekly sync:

Renames

1. EcDSA.ES256K -> Secp256k1
   • This is the AsymmetricKeyGenerator and Signer that performs cryptographic operations using ECDSA with the secp256k1 elliptic curve and SHA-256
2. EDDSA.Ed25519 -> Ed25519
   • This is the AsymmetricKeyGenerator and Signer that performs cryptographic operations using EdDSA with the Ed25519 curve
3. CryptoAlgorithm.es256k -> CryptoAlgorithm.secp256k1
   • This is algorithm identifier that can be provided to generatePrivateKey to create a new private key

[jiyoonie9]

i understood most of these coz we talked about crypto package earlier! makes sense to me 🎉

[jiyoonie9]

curious why github makes this one look like it's a brand new file 🤔