Add keyboard shortcuts for scrolling in terminal (#13508)

Fixes #4917, #12231

Release Notes:
-  Added keyboard shortcuts for scrolling in terminal ([4917](https://github.com/zed-industries/zed/issues/4917), [12231](https://github.com/zed-industries/zed/issues/12231))

crates/terminal/src/terminal.rs

@@ -64,7 +64,19 @@ use crate::mappings::{colors::to_alac_rgb, keys::to_esc_str};
 
 actions!(
     terminal,
-    [Clear, Copy, Paste, ShowCharacterPalette, SearchTest,]
+    [
+        Clear,
+        Copy,
+        Paste,
+        ShowCharacterPalette,
+        SearchTest,
+        ScrollLineUp,
+        ScrollLineDown,
+        ScrollPageUp,
+        ScrollPageDown,
+        ScrollToTop,
+        ScrollToBottom,
+    ]
 );
 
 ///Scrolling is unbearably sluggish by default. Alacritty supports a configurable
@@ -982,6 +994,36 @@ impl Terminal {
         self.events.push_back(InternalEvent::Clear)
     }
 
+    pub fn scroll_line_up(&mut self) {
+        self.events
+            .push_back(InternalEvent::Scroll(AlacScroll::Delta(1)));
+    }
+
+    pub fn scroll_line_down(&mut self) {
+        self.events
+            .push_back(InternalEvent::Scroll(AlacScroll::Delta(-1)));
+    }
+
+    pub fn scroll_page_up(&mut self) {
+        self.events
+            .push_back(InternalEvent::Scroll(AlacScroll::PageUp));
+    }
+
+    pub fn scroll_page_down(&mut self) {
+        self.events
+            .push_back(InternalEvent::Scroll(AlacScroll::PageDown));
+    }
+
+    pub fn scroll_to_top(&mut self) {
+        self.events
+            .push_back(InternalEvent::Scroll(AlacScroll::Top));
+    }
+
+    pub fn scroll_to_bottom(&mut self) {
+        self.events
+            .push_back(InternalEvent::Scroll(AlacScroll::Bottom));
+    }
+
     ///Resize the terminal and the PTY.
     pub fn set_size(&mut self, new_size: TerminalSize) {
         if self.last_content.size != new_size {