Feature/optimize plonk verifier (#11)

* Add plonk support

* Update Plonk verifier template

* modified plonk verifier templates

* refactored solidity plonk verifier

* renamed variable inside calculatePI function

* tweaks

* revert weird

* optimization?

* pretty

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Co-authored-by: mllwchrry <[email protected]>
Co-authored-by: Artem Chystiakov <[email protected]>