Add mcrypto recipe

[aelxtpt]

Adds a recipe for mcrypto, a source-layout Mojo cryptography library: fixed hashes and XOFs, stream and block ciphers, AEAD, MACs, KDFs, public-key encryption, KEM, signatures, and secure-memory helpers.

Checklist

• My recipe.yaml file specifies which version(s) of MAX is compatible with my project — mojo_version: ">=1.0.0,<1.1.0" in context, applied to mojo-compiler in build/host/run. That range resolves to 1.0.0 today and mirrors the library's own pixi.toml pin (mojo ==1.0.0). The source imports only std, so no max runtime dependency is required.
• License file is packaged — license_file: LICENSE, shipped as info/licenses/LICENSE.
• Set the build number to 0 (new package).
• Bumped the build number — n/a, this is the first submission.

Verification
Built locally with:

rattler-build build --recipe conda.recipe/recipe.yaml \
  -c conda-forge \
  -c https://conda.modular.com/max \
  -c https://repo.prefix.dev/modular-community

Result: mcrypto-0.1.0-h60d57d3_0.conda, with ✔ all tests passed!. The artifact ships lib/mojo/mcrypto.mojoc, and the recipe's smoke test runs against the installed package (not the source tree), exercising SHA-256, SHAKE128, XChaCha20-Poly1305 (round trip plus tamper detection), CMAC, and HKDF-SHA256.

Also checked: the recipe validates against the official recipe-format JSON schema, and mojo-compiler 1.0.0 is available on all three CI platforms (linux-64, linux-aarch64, osx-arm64).

[alisterburt]

thank you @aelxtpt !