Add `PyWeightProof` class to prevent unnecessary conversions of large vectors

[coveralls-official[bot]]

Pull Request Test Coverage Report for Build 9681769739

Details

• 7 of 171 (4.09%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+3.1%) to 81.831%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
wheel/src/weight_proof.rs	0	164	0.0%
<!--	Total:	7	171	4.09%	-->

Totals
Change from base Build 9645397669:	3.1%
Covered Lines:	11674
Relevant Lines:	14266

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