Add uv publish: Basic upload with username/password or keyring

What works:
* Basic upload to pypi with username/password (username must be `__token__`, but it uses the same HTTP headers)
* Error messages

What's missing:
* Testing on CI. I have a test script for testpypi for both username/password and keyring (next PR), but we need to run it in CI in a secure way.
* Trusted publishing from GitHub actions with OIDC, and testing for it.
* Other registries?

Cargo.toml

@@ -45,6 +45,7 @@ uv-metadata = { path = "crates/uv-metadata" }
 uv-normalize = { path = "crates/uv-normalize" }
 uv-options-metadata = { path = "crates/uv-options-metadata" }
 uv-pubgrub = { path = "crates/uv-pubgrub" }
+uv-publish = { path = "crates/uv-publish" }
 uv-python = { path = "crates/uv-python" }
 uv-requirements = { path = "crates/uv-requirements" }
 uv-resolver = { path = "crates/uv-resolver" }
@@ -118,12 +119,13 @@ proc-macro2 = { version = "1.0.86" }
 pubgrub = { git = "https://github.com/astral-sh/pubgrub", rev = "388685a8711092971930986644cfed152d1a1f6c" }
 pyo3 = { version = "0.21.2" }
 pyo3-log = { version = "0.10.0" }
+python-pkginfo = { version = "0.6.2" }
 quote = { version = "1.0.37" }
 rayon = { version = "1.10.0" }
 reflink-copy = { version = "0.1.19" }
 regex = { version = "1.10.6" }
-reqwest = { version = "0.12.7", default-features = false, features = ["json", "gzip", "stream", "rustls-tls", "rustls-tls-native-roots"] }
-reqwest-middleware = { git = "https://github.com/astral-sh/reqwest-middleware", rev = "5e3eaf254b5bd481c75d2710eed055f95b756913" }
+reqwest = { version = "0.12.7", default-features = false, features = ["json", "gzip", "stream", "rustls-tls", "rustls-tls-native-roots", "multipart"] }
+reqwest-middleware = { git = "https://github.com/astral-sh/reqwest-middleware", rev = "5e3eaf254b5bd481c75d2710eed055f95b756913", features = ["multipart"] }
 reqwest-retry = { git = "https://github.com/astral-sh/reqwest-middleware", rev = "5e3eaf254b5bd481c75d2710eed055f95b756913" }
 rkyv = { version = "0.7.45", features = ["strict", "validation"] }
 rmp-serde = { version = "1.3.0" }

crates/distribution-filename/src/lib.rs

@@ -67,6 +67,14 @@ impl DistFilename {
             Self::WheelFilename(filename) => &filename.version,
         }
     }
+
+    /// Whether the file is a `bdist_wheel` or an `sdist`.
+    pub fn filetype(&self) -> &'static str {
+        match self {
+            Self::SourceDistFilename(_) => "sdist",
+            Self::WheelFilename(_) => "bdist_wheel",
+        }
+    }
 }
 
 impl Display for DistFilename {