Jo dac3161f90 Check hash of downloaded python toolchain (#4806) ...

## Summary

Check the sha256 checksum when downloading a managed python toolchain.

## Test Plan

```sh
$ cargo run -- python install 3.12

warning: `uv python install` is experimental and may change without warning.
Looking for installation Python 3.12.3 (any-3.12.3-any-any-any)
Downloading cpython-3.12.3-windows-x86_64-none
Installed Python 3.12.3 to C:\Users\jo\AppData\Roaming\uv\data\python\cpython-3.12.3-windows-x86_64-none
Installed 1 installation in 6s

$ cargo run -- python uninstall 3.12

$ # manually change the hash in `crates/uv-python/src/downloads.inc`

$ cargo run -- python install 3.12

warning: `uv python install` is experimental and may change without warning.
Looking for installation Python 3.12 (any-3.12-any-any-any)
Downloading cpython-3.12.3-windows-x86_64-none
error: Hash mismatch for `cpython-3.12.3-windows-x86_64-none`

Expected:
xx

Computed:
776568c92c5f3b47dbf5f17c1c58578f70d75a32654419a158aa8bdc6f95b09a
```

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..

discovery.rs

Change "toolchain" to "python" (#4735)

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downloads.inc

Use optimized versions of managed Python on Linux (#4775)

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downloads.inc.mustache

Change "toolchain" to "python" (#4735)

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downloads.rs

Check hash of downloaded python toolchain (#4806)

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environment.rs

Change "toolchain" to "python" (#4735)

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implementation.rs

Change "toolchain" to "python" (#4735)

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installation.rs

Change "toolchain" to "python" (#4735)

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interpreter.rs

Always use base interpreter for cached environments (#4805)

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lib.rs

Change "toolchain" to "python" (#4735)

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managed.rs

Change "toolchain" to "python" (#4735)

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platform.rs

Change "toolchain" to "python" (#4735)

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pointer_size.rs

Change "toolchain" to "python" (#4735)

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prefix.rs

Change "toolchain" to "python" (#4735)

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py_launcher.rs

Change "toolchain" to "python" (#4735)

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python_version.rs

Change "toolchain" to "python" (#4735)

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target.rs

Change "toolchain" to "python" (#4735)

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version_files.rs

Change "toolchain" to "python" (#4735)

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virtualenv.rs

Change "toolchain" to "python" (#4735)

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