Feature: Blake2xb and LtHash

[liss-h]

TODOs: (some of the stuff is probably more something for you, alex)

• fix cmake conan integration so that sodium is actually fetched
• maybe figure out how to disable AVX2 or SSE extensions for sodium to get accurate benchmark results
• Since this is based on folly: License stuff? (not copy pasted but idk how this works)

More general:

• figure out if and how we want to integrate them with the rest of the library -> for now we don't want to integrate
• implement allocator support
• update readme
• add examples
• implement blake2b wrapper
• documentation
• fix cmake and conan @bigerl

[bigerl]

with gcc-12 I get:

dice-hash/include/dice/hash/blake2xb/Blake2xb.hpp:143:45: error: ‘constexpr’ static data member ‘private_tag’ must have an initializer
  143 |                 static constexpr PrivateTag private_tag;

[liss-h]

Thx for getting the basics set up. I managed to fix the test and example runs, but have no idea why the two failing actions are failing so would be nice if you could have a look at those two.

Btw: needed to update to gcc11 and clang11 because gcc10 and clang10 were not able to build the project anymore.

[liss-h]

And update on sodium: The license is ISC so copying it over would be fine.
I think just copying over this folder should do it.

[liss-h]

So, since integrating libsodium here directly turned out to be a little more problematic than anticipated, I instead added a flag to conditionally enable libsodium support (and therefore Blake2b, Blake2Xb and LtHash).

The flag is called WITH_SODIUM, as in cmake -DWITH_SODIUM=OFF ....
The default is currently ON but I can change that of course if you prefer @bigerl.

[mcb5637]

POBR diff fails, because i fixed the files to be checked by it

[liss-h]

First review, mostly buildsystem related

[liss-h]

highway stuff looks good to me 👍

[liss-h]

Some stuff left

[liss-h]

I think this is good to go now.

Just to be extra sure: could you try if it works as a dependency in another library?