Add uv add --no-editable (#5246)

## Summary

Resolves #5241

## Test Plan

```sh
# create a workspace with sub-packages `pkg-a` and `pkg-b`

$ cd ./pkg-b
$ cargo run -- add ./pkg-a --no-editable

$ cat ./pyproject.toml
[project]
name = "pkg-b"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
dependencies = [
    "pkg-a",
]

[tool.uv]
dev-dependencies = []

[tool.uv.sources]
pkg-a = { workspace = true, editable = false }
```

crates/uv-cli/src/lib.rs

@@ -1983,9 +1983,12 @@ pub struct AddArgs {
     #[arg(long, conflicts_with("dev"))]
     pub optional: Option<ExtraName>,
 
-    /// Add the requirements as editables.
+    #[arg(long, overrides_with = "no_editable", hide = true)]
-    #[arg(long, default_missing_value = "true", num_args(0..=1))]
+    pub editable: bool,
-    pub editable: Option<bool>,
+
+    /// Don't add the requirements as editables.
+    #[arg(long, overrides_with = "editable")]
+    pub no_editable: bool,
 
     /// Add source requirements to the `project.dependencies` section of the `pyproject.toml`.
     ///

crates/uv/src/settings.rs

@@ -609,6 +609,7 @@ impl AddSettings {
             dev,
             optional,
             editable,
+            no_editable,
             extra,
             raw_sources,
             rev,
@@ -641,13 +642,13 @@ impl AddSettings {
             frozen,
             requirements,
             dependency_type,
-            editable,
             raw_sources,
             rev,
             tag,
             branch,
             package,
             python,
+            editable: flag(editable, no_editable),
             extras: extra.unwrap_or_default(),
             refresh: Refresh::from(refresh),
             settings: ResolverInstallerSettings::combine(