UkoeHB

[seraphis] seraphis_crypto: add seraphis hash functions

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This is a PR in my 'upstreaming seraphis_lib project', the changes here are not used anywhere yet. Adds hash functions on top of Blake2b. ### TODO - [x] Depends on...

tools: update variant

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`variant` changes from `seraphis_lib` - https://github.com/UkoeHB/monero/pull/28 - https://github.com/UkoeHB/monero/pull/49 @jeffro256

This is a PR in my 'upstreaming seraphis_lib project', the changes here are not used anywhere yet. Depends on: - https://github.com/monero-project/monero/pull/9336 Adds an async framework. ### `async::Threadpool` Adds a threadpool...

This is a PR in my 'upstreaming seraphis_lib project', the changes here are not used anywhere yet. Adds a set of crypto utility functions. Some functions were taken from code...