Adapt different hashers for Poseidon Sponge construction

[tsunrise]

Description

This PR will add support for alternative hashers (such as the filecoin optimization) to sponge duplex construction.
(Work in progress)

closes: arkworks-rs/crypto-primitives#91

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• Targeted PR against correct branch (master)
• Linked to Github issue with discussion and accepted design OR have an explanation in the PR that describes this work.
• Wrote unit tests
• Updated relevant documentation in the code
• Added a relevant changelog entry to the Pending section in CHANGELOG.md
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