New struct: Sticker, MaskPosition; Sticker requires PhotoSize by @no111u3

src/core/types/mask_position.rs

@@ -0,0 +1,10 @@
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize, Hash, PartialEq, Eq)]
+pub struct MaskPosition {
+    pub point: String,
+    pub x_shift: f64,
+    pub y_shift: f64,
+    pub scale: f64,
+}
+

src/core/types/sticker.rs

@@ -0,0 +1,16 @@
+use serde::Deserialize;
+
+use crate::core::types::{PhotoSize, MaskPosition};
+
+#[derive(Debug, Deserialize, Hash, PartialEq, Eq)]
+pub struct Sticker {
+    pub file_id: String,
+    pub width: i32,
+    pub height: i32,
+    pub is_animated: bool,
+    pub thumb: Option<PhotoSize>,
+    pub emoji: Option<String>,
+    pub set_name: Option<String>,
+    pub mask_position: Option<MaskPosition>,
+    pub file_size: Option<i64>,
+}