Move --config-settings structs into uv-distribution-types (#15278)

## Summary

This breaks up a cycle I'm running into in incorporating the build
configuration into our cache keys. This is actually a type that ends up
in the frontend build system, etc., so I think it makes more sense here
anyway (as opposed to `uv-configuration` which tend to be our own
user-facing types).

crates/uv-distribution/src/index/built_wheel_index.rs

@@ -3,10 +3,10 @@ use std::borrow::Cow;
 use uv_cache::{Cache, CacheBucket, CacheShard, WheelCache};
 use uv_cache_info::CacheInfo;
 use uv_cache_key::cache_digest;
-use uv_configuration::{ConfigSettings, PackageConfigSettings};
 use uv_distribution_types::{
-    BuildVariables, DirectUrlSourceDist, DirectorySourceDist, ExtraBuildRequirement,
-    ExtraBuildRequires, ExtraBuildVariables, GitSourceDist, Hashed, PathSourceDist,
+    BuildVariables, ConfigSettings, DirectUrlSourceDist, DirectorySourceDist,
+    ExtraBuildRequirement, ExtraBuildRequires, ExtraBuildVariables, GitSourceDist, Hashed,
+    PackageConfigSettings, PathSourceDist,
 };
 use uv_normalize::PackageName;
 use uv_platform_tags::Tags;

crates/uv-distribution/src/index/registry_wheel_index.rs

@@ -5,10 +5,9 @@ use rustc_hash::{FxHashMap, FxHashSet};
 
 use uv_cache::{Cache, CacheBucket, WheelCache};
 use uv_cache_key::cache_digest;
-use uv_configuration::{ConfigSettings, PackageConfigSettings};
 use uv_distribution_types::{
-    BuildVariables, CachedRegistryDist, ExtraBuildRequirement, ExtraBuildRequires,
-    ExtraBuildVariables, Hashed, Index, IndexLocations, IndexUrl,
+    BuildVariables, CachedRegistryDist, ConfigSettings, ExtraBuildRequirement, ExtraBuildRequires,
+    ExtraBuildVariables, Hashed, Index, IndexLocations, IndexUrl, PackageConfigSettings,
 };
 use uv_fs::{directories, files};
 use uv_normalize::PackageName;

crates/uv-distribution/src/source/mod.rs

@@ -29,11 +29,11 @@ use uv_cache_key::cache_digest;
 use uv_client::{
     CacheControl, CachedClientError, Connectivity, DataWithCachePolicy, RegistryClient,
 };
-use uv_configuration::{BuildKind, BuildOutput, ConfigSettings, SourceStrategy};
+use uv_configuration::{BuildKind, BuildOutput, SourceStrategy};
 use uv_distribution_filename::{SourceDistExtension, WheelFilename};
 use uv_distribution_types::{
-    BuildVariables, BuildableSource, DirectorySourceUrl, ExtraBuildRequirement, GitSourceUrl,
-    HashPolicy, Hashed, IndexUrl, PathSourceUrl, SourceDist, SourceUrl,
+    BuildVariables, BuildableSource, ConfigSettings, DirectorySourceUrl, ExtraBuildRequirement,
+    GitSourceUrl, HashPolicy, Hashed, IndexUrl, PathSourceUrl, SourceDist, SourceUrl,
 };
 use uv_extract::hash::Hasher;
 use uv_fs::{rename_with_retry, write_atomic};