Allow UI font weight to be assigned in settings (#12333)

Release Notes:

- Added the ability to configure the weight of your UI font in standard
CSS weight units from 0 to 900.

crates/editor/src/editor.rs

@@ -11466,7 +11466,7 @@ impl Render for Editor {
                 font_family: settings.ui_font.family.clone(),
                 font_features: settings.ui_font.features.clone(),
                 font_size: rems(0.875).into(),
-                font_weight: FontWeight::NORMAL,
+                font_weight: settings.ui_font.weight,
                 font_style: FontStyle::Normal,
                 line_height: relative(settings.buffer_line_height.value()),
                 background_color: None,
@@ -11479,7 +11479,7 @@ impl Render for Editor {
                 font_family: settings.buffer_font.family.clone(),
                 font_features: settings.buffer_font.features.clone(),
                 font_size: settings.buffer_font_size(cx).into(),
-                font_weight: FontWeight::NORMAL,
+                font_weight: settings.buffer_font.weight,
                 font_style: FontStyle::Normal,
                 line_height: relative(settings.buffer_line_height.value()),
                 background_color: None,