Align with Substrate in terms of secp256k1 library

[jacogr]

See paritytech/substrate#10798

There is also https://docs.rs/k256/latest/k256/index.html

Important here is not only speed (it is critical, but not as critical as the runtime), but also size of the resulting outputs.

[jacogr]

Also check #307 - it seems we have an issue with the current asm :(

[polkadot-js-bot]

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