CHIA-899: Add Python binding to scalar_multiply

[Rigidity]

No description provided.

[coveralls-official]

Pull Request Test Coverage Report for Build 9842425663

Details

• 19 of 31 (61.29%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.05%) to 82.623%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
crates/chia-bls/src/public_key.rs	0	6	0.0%
crates/chia-bls/src/signature.rs	19	25	76.0%

Totals
Change from base Build 9842116781:	-0.05%
Covered Lines:	11573
Relevant Lines:	14007

---

💛 - Coveralls

[arvidn]

we don't have a very comprehensive test for BLS on the python side, but for new python bindings, I think it would be good to also add some simple tests in python, exercising the bindings themselves

[arvidn]

proper test in rust (and maybe even a property test in a fuzzer) would be warranted

[arvidn]

you should have a comment with a reference where this test vector comes from, or you could turn it into a property-check, to ensure the result satisfies some expected properties of scalar multiplication