fix(inspect): show priority for treesitter highlights

Problem: `:Inspect` does not show priority for treesitter highlights,
leading to confusion why sometimes earlier highlights override later
highlights.

Solution: Also print priority metadata if set.
(cherry picked from commit 9c278af7cc)

runtime/lua/vim/_inspector.lua

@@ -182,7 +182,12 @@ function vim.show_pos(bufnr, row, col, filter)
     append('Treesitter', 'Title')
     nl()
     for _, capture in ipairs(items.treesitter) do
-      item(capture, capture.lang)
+      item(
+        capture,
+        capture.metadata.priority
+            and string.format('%s priority: %d', capture.lang, capture.metadata.priority)
+          or capture.lang
+      )
     end
     nl()
   end