Add XWingDraft06 KEM support to hpke-rs, and replace evercrypt provider with new libcrux provider

[wysiwys]

This PR adds support to the hpke-rs and hpke-rs-crypto crates for XWingDraft06 KEM, and includes updates to the HpkeCrypto trait that take this change into account.

It also replaces the Evercrypt provider crate (hpke-rs-evercrypt) with a new Libcrux provider crate (hpke-rs-libcrux), which is built on pure Rust dependencies.

Additionally, this PR upgrades rand=0.8->rand=0.9 for all crates in the project (with the exception that, for the Rust crypto provider hpke-rs-rust-crypto, the rand=0.8 traits are implemented, for compatibility with dependencies)

Currently, this branch depends on new versions of libcrux dependencies in the main branch.

Clippy lints are also applied.

Resolves #71

[keks]

This looks like it goes in exactly the right direction! I left a few comments, including an idea where the CI failure might come from.

[franziskuskiefer]

Looks like coverage fails because of rust-lang/rust#131829

[keks]

In OpenMLS we use the new cli options, they should work here, too: https://github.com./openmls/openmls/blob/main/.github/workflows/coverage.yml

[wysiwys]

The coverage.yml workflow now uses the correct flags (updated in #74)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 78.31633% with 85 lines in your changes missing coverage. Please review.

Project coverage is 44.32%. Comparing base (2460bab) to head (7688297).

Files with missing lines	Patch %	Lines
libcrux_provider/src/lib.rs	81.39%	40 Missing ⚠️
rust_crypto_provider/src/lib.rs	50.00%	24 Missing ⚠️
src/kem.rs	74.19%	8 Missing ⚠️
src/lib.rs	82.75%	5 Missing ⚠️
traits/src/error.rs	0.00%	5 Missing ⚠️
traits/src/types.rs	66.66%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #72      +/-   ##
==========================================
- Coverage   44.65%   44.32%   -0.33%     
==========================================
  Files          15       16       +1     
  Lines        3630     4708    +1078     
==========================================
+ Hits         1621     2087     +466     
- Misses       2009     2621     +612     

Files with missing lines	Coverage Δ
src/dh_kem.rs	92.30% <100.00%> (-0.12%)	⬇️
src/kdf.rs	100.00% <100.00%> (ø)
src/test_aead.rs	100.00% <100.00%> (ø)
src/test_kdf.rs	100.00% <100.00%> (ø)
src/util.rs	48.33% <100.00%> (-35.01%)	⬇️
tests/test_hpke.rs	100.00% <100.00%> (ø)
tests/test_hpke_kat.rs	91.75% <100.00%> (+1.22%)	⬆️
traits/src/lib.rs	96.29% <ø> (ø)
traits/src/types.rs	57.30% <66.66%> (-1.19%)	⬇️
src/lib.rs	37.76% <82.75%> (-0.52%)	⬇️
... and 4 more

... and 1 file with indirect coverage changes

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[franziskuskiefer]

Can you add the changes from here to the changelog?

[keks]

I think this looks good!