macOS: Support all OpenType font features (#11611)

This PR brings support for all `OpenType` font features to
`macOS(v10.10+)`. Now, both `Windows`(with #10756 ) and `macOS` support
all font features.

Due to my limited familiarity with the APIs on macOS, I believe I have
made sure to call `CFRelease` on all variables where it should be
called.

Close #11486 , and I think the official website's
[documentation](https://zed.dev/docs/configuring-zed) can be updated
after merging this PR.

> Zed supports a subset of OpenType features that can be enabled or
disabled for a given buffer or terminal font. The following OpenType
features can be enabled or disabled too: calt, case, cpsp, frac, liga,
onum, ordn, pnum, ss01, ss02, ss03, ss04, ss05, ss06, ss07, ss08, ss09,
ss10, ss11, ss12, ss13, ss14, ss15, ss16, ss17, ss18, ss19, ss20, subs,
sups, swsh, titl, tnum, zero.



https://github.com/zed-industries/zed/assets/14981363/44e503f9-1496-4746-bc7d-20878c6f8a93



Release Notes:

- Added support for **all** `OpenType` font features to macOS.

crates/gpui/src/text_system/font_features.rs

@@ -1,6 +1,4 @@
-#[cfg(target_os = "windows")]
 use crate::SharedString;
-#[cfg(target_os = "windows")]
 use itertools::Itertools;
 use schemars::{
     schema::{InstanceType, Schema, SchemaObject, SingleOrVec},
@@ -15,9 +13,7 @@ macro_rules! create_definitions {
         pub struct FontFeatures {
             enabled: u64,
             disabled: u64,
-            #[cfg(target_os = "windows")]
             other_enabled: SharedString,
-            #[cfg(target_os = "windows")]
             other_disabled: SharedString,
         }
 
@@ -37,7 +33,6 @@ macro_rules! create_definitions {
 
             /// Get the tag name list of the font OpenType features
             /// only enabled or disabled features are returned
-            #[cfg(target_os = "windows")]
             pub fn tag_value_list(&self) -> Vec<(String, bool)> {
                 let mut result = Vec::new();
                 $(
@@ -105,29 +100,6 @@ macro_rules! create_definitions {
                         formatter.write_str("a map of font features")
                     }
 
-                    #[cfg(not(target_os = "windows"))]
-                    fn visit_map<M>(self, mut access: M) -> Result<Self::Value, M::Error>
-                    where
-                        M: MapAccess<'de>,
-                    {
-                        let mut enabled: u64 = 0;
-                        let mut disabled: u64 = 0;
-
-                        while let Some((key, value)) = access.next_entry::<String, Option<bool>>()? {
-                            let idx = match key.as_str() {
-                                $(stringify!($name) => $idx,)*
-                                _ => continue,
-                            };
-                            match value {
-                                Some(true) => enabled |= 1 << idx,
-                                Some(false) => disabled |= 1 << idx,
-                                None => {}
-                            };
-                        }
-                        Ok(FontFeatures { enabled, disabled })
-                    }
-
-                    #[cfg(target_os = "windows")]
                     fn visit_map<M>(self, mut access: M) -> Result<Self::Value, M::Error>
                     where
                         M: MapAccess<'de>,