feat(toast): add hue property for the ionic theme (#30333)

Issue number: internal

---------

## What is the current behavior?
The toast component does not support the `hue` property.

## What is the new behavior?
Adds support for the `subtle` hue for the toast. Defaults to `subtle`.

## Does this introduce a breaking change?
- [ ] Yes
- [x] No

Author: brandyscarney

core/api.txt

@@ -2436,6 +2436,7 @@ ion-toast,prop,duration,number,config.getNumber('toastDuration', 0),false,false
 ion-toast,prop,enterAnimation,((baseEl: any, opts?: any) => Animation) | undefined,undefined,false,false
 ion-toast,prop,header,string | undefined,undefined,false,false
 ion-toast,prop,htmlAttributes,undefined | { [key: string]: any; },undefined,false,false
+ion-toast,prop,hue,"bold" | "subtle" | undefined,'subtle',false,false
 ion-toast,prop,icon,string | undefined,undefined,false,false
 ion-toast,prop,isOpen,boolean,false,false,false
 ion-toast,prop,keyboardClose,boolean,false,false,false

core/src/components.d.ts

@@ -3844,6 +3844,10 @@ export namespace Components {
           * Additional attributes to pass to the toast.
          */
         "htmlAttributes"?: { [key: string]: any };
+        /**
+          * Set to `"bold"` for a toast with vibrant, bold colors or to `"subtle"` for a toast with muted, subtle colors.  Only applies to the `ionic` theme.
+         */
+        "hue"?: 'bold' | 'subtle';
         /**
           * The name of the icon to display, or the path to a valid SVG file. See `ion-icon`. https://ionic.io/ionicons
          */
@@ -9384,6 +9388,10 @@ declare namespace LocalJSX {
           * Additional attributes to pass to the toast.
          */
         "htmlAttributes"?: { [key: string]: any };
+        /**
+          * Set to `"bold"` for a toast with vibrant, bold colors or to `"subtle"` for a toast with muted, subtle colors.  Only applies to the `ionic` theme.
+         */
+        "hue"?: 'bold' | 'subtle';
         /**
           * The name of the icon to display, or the path to a valid SVG file. See `ion-icon`. https://ionic.io/ionicons
          */