whirlpool implementation

[teobiton]

Whirlpool is a hash algorithm that is different from the SHA family. It apparently supports parallelization so it would be fit for hardware.
Creating this issue to track down its implementation.

• Software model
• Software model tests
• CI update to run checks on whirlpool model
• RTL design of top-level and algorithm
• cocotb tests for whirlpool algorithm
• CI update to run checks on whirlpool RTL code

Relevant documentation:

• https://en.wikipedia.org/wiki/Whirlpool_(hash_function)
• https://web.archive.org/web/20171129084214/http://www.larc.usp.br/~pbarreto/WhirlpoolPage.html