Use Textual's TextArea.code_editor if available

Textual 0.48 introduces a breaking change for the `TextArea` widget:
line wrapping is now enabled by default. Since we don't want line
wrapping, we need to disable that. Fortunately, a new alternative
constructor called `TextArea.code_editor` is introduced, and
constructing the `TextArea` using it retains the old behavior.
Unfortunately, that alternative constructor didn't exist prior to
Textual 0.48, so we need to conditionally fall back to simply using the
`TextArea` constructor when `TextArea.code_editor` doesn't exist.

Signed-off-by: Matt Wozniski <mwozniski@bloomberg.net>

Author: godlygeek

src/memray/reporters/tree.py

@@ -181,6 +181,7 @@ def compose(self) -> ComposeResult:
         text.show_line_numbers = False
         text.can_focus = False
         text.cursor_blink = False
+        text.soft_wrap = False
 
         labels: list[Label] = []
         content_by_label_id = self._get_content_by_label_id()