Refactor starkware-crypto-utils to use starknet.js

[SergeyVolynkin]

Is your feature request related to a problem? Please describe.
Would it be possible to refactor library code to leverage starknet.js instead of duplicated logic? (e.g. probably most of the src/js/signature.js can be replaced with starknet.js)

Describe the solution you'd like
Use starknet.js where possible for the utils code

Describe alternatives you've considered
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Additional context
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