SigVerifyCost for ED25519 & Secp256k1

[gavinly]

1. https://github.com/gavinly/CosmosParametersWiki/blob/master/Auth.md#4-sigverifycosted25519
2. https://github.com/gavinly/CosmosParametersWiki/blob/master/Auth.md#5-sigverifycostsecp256k1