Change stroke style set up

Summary:
# Context
We are working on migrating showreel bloks ads to native implementation and one important feature is TextOverlay. In showreel bloks, the text overlay rendering heavily rely on RichTextView. We tried using TextView instead (See diff stack D63923873) but experiment shows large frame drop regressions (https://fburl.com/gdoc/fcnxfgzs) which is likely caused by the dynamic text sizing logic. To make the native implementation as close as showreel bloks, we plan to switch to RichText litho component so we can reuse similar dynamic text sizing logic from showreel bloks.

Tech spec: https://fburl.com/gdoc/myn5fzc0

# This diff
* support stroke style without modifying TextStyle as it is shared across Bloks and Litho (see comments in D68187778 for more context)

Reviewed By: xzhch1622

Differential Revision: D68587164

fbshipit-source-id: d6c660f4aceca8ed6efc91fa68f435a6c1e8c29a

litho-rendercore-text/src/main/java/com/facebook/rendercore/text/TextStyle.java

@@ -71,8 +71,6 @@ public class TextStyle implements Cloneable {
   int highlightEndOffset = UNSET;
   int highlightCornerRadius = 0;
   boolean shouldLayoutEmptyText = false;
-  int strokeColor = Color.TRANSPARENT;
-  int strokeWidth = 0;
 
   boolean shouldTruncateTextUsingConstraints = false;
   int manualBaselineSpacing = Integer.MIN_VALUE;
@@ -359,9 +357,4 @@ public RoundedBackgroundProps(RectF padding, float cornerRadius, int backgroundC
       this.backgroundColor = backgroundColor;
     }
   }
-
-  public void setStrokeStyle(int strokeColor, int strokeWidth) {
-    this.strokeColor = strokeColor;
-    this.strokeWidth = strokeWidth;
-  }
 }