Add secp256k1 and secp256r1 types

[Rigidity]

No description provided.

[arvidn]

I think there's a fair amount of missing test coverage

[coveralls-official]

Pull Request Test Coverage Report for Build 12299677736

Details

• 335 of 394 (85.03%) changed or added relevant lines in 9 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 83.972%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
crates/chia-secp/src/secp256k1/secret_key.rs	16	22	72.73%
crates/chia-secp/src/secp256k1/signature.rs	12	18	66.67%
crates/chia-secp/src/secp256r1/secret_key.rs	16	22	72.73%
crates/chia-secp/src/secp256r1/signature.rs	12	18	66.67%
crates/clvm-traits/src/from_clvm.rs	115	126	91.27%
crates/chia-secp/src/secp256k1/public_key.rs	15	27	55.56%
crates/chia-secp/src/secp256r1/public_key.rs	15	27	55.56%

Totals
Change from base Build 12286844688:	0.03%
Covered Lines:	13349
Relevant Lines:	15897

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💛 - Coveralls