Remove str deunicode (nushell#13693)

# Description
Closes nushell#13677

Remove the command `str deunicode`, as it has a narrow application, is
loosely defined by the data provided by the `deunicode` crate and thus a
stabilization liability post-1.0.

Furthermore the data to perform the look-up is quite substantial.

Removing the command and the `deunicode` dependency saves 0.9 MB of
binary data in release mode (~ 2% of total)

(checked via `cargo bloat --release` for a linux x86 build)


# User-Facing Changes
The `str deunicode` command recently added in nushell#13270 is gone

Cargo.toml

@@ -81,7 +81,6 @@ crossbeam-channel = "0.5.8"
 crossterm = "0.27"
 csv = "1.3"
 ctrlc = "3.4"
-deunicode = "1.6.0"
 dialoguer = { default-features = false, version = "0.11" }
 digest = { default-features = false, version = "0.10" }
 dirs = "5.0"

crates/nu-command/Cargo.toml

@@ -42,7 +42,6 @@ chrono-humanize = { workspace = true }
 chrono-tz = { workspace = true }
 crossterm = { workspace = true }
 csv = { workspace = true }
-deunicode = { workspace = true }
 dialoguer = { workspace = true, default-features = false, features = ["fuzzy-select"] }
 digest = { workspace = true, default-features = false }
 dtparse = { workspace = true }

crates/nu-command/src/default_context.rs

@@ -199,7 +199,6 @@ pub fn add_shell_command_context(mut engine_state: EngineState) -> EngineState {
             Str,
             StrCapitalize,
             StrContains,
-            StrDeunicode,
             StrDistance,
             StrDowncase,
             StrEndswith,

crates/nu-command/src/strings/str_/mod.rs

@@ -1,6 +1,5 @@
 mod case;
 mod contains;
-mod deunicode;
 mod distance;
 mod ends_with;
 mod expand;
@@ -16,7 +15,6 @@ mod trim;
 
 pub use case::*;
 pub use contains::SubCommand as StrContains;
-pub use deunicode::SubCommand as StrDeunicode;
 pub use distance::SubCommand as StrDistance;
 pub use ends_with::SubCommand as StrEndswith;
 pub use expand::SubCommand as StrExpand;