Add word and line movement in vim normal mode

Add jump to start and end of the document
Move vim tests to relevant vim files
Rename VimTestAppContext to VimTestContext for brevity
Improve VimTestContext assertions to pretty print locations when selection position assertion panics

crates/language/src/buffer.rs

@@ -276,6 +276,16 @@ pub enum CharKind {
     Word,
 }
 
+impl CharKind {
+    pub fn coerce_punctuation(self, treat_punctuation_as_word: bool) -> Self {
+        if treat_punctuation_as_word && self == CharKind::Punctuation {
+            CharKind::Word
+        } else {
+            self
+        }
+    }
+}
+
 impl Buffer {
     pub fn new<T: Into<Arc<str>>>(
         replica_id: ReplicaId,