Add --group support to uv add and uv remove (#8108)

Part of #8090

Adds the ability to add and remove dependencies from arbitrary groups
using `uv add` and `uv remove`. Does not include resolving with the new
dependencies — tackling that in #8110.

Additionally, this does not yet resolve interactions with the existing
`dev` group — we'll tackle that separately as well. I probably won't
merge the stack until that design is resolved.

crates/uv-resolver/src/lock/mod.rs

@@ -580,7 +580,7 @@ impl Lock {
         marker_env: &ResolverMarkerEnvironment,
         tags: &Tags,
         extras: &ExtrasSpecification,
-        dev: DevSpecification<'_>,
+        dev: &DevSpecification,
         build_options: &BuildOptions,
         install_options: &InstallOptions,
     ) -> Result<Resolution, LockError> {

crates/uv-resolver/src/lock/requirements_txt.rs

@@ -43,7 +43,7 @@ impl<'lock> RequirementsTxtExport<'lock> {
         lock: &'lock Lock,
         root_name: &PackageName,
         extras: &ExtrasSpecification,
-        dev: DevSpecification<'_>,
+        dev: &DevSpecification,
         editable: EditableMode,
         hashes: bool,
         install_options: &'lock InstallOptions,