feat(vim.version): add __eq to vim.VersionRange #38881

Problem: vim.VersionRange had no __eq metamethod, so comparing 2 distinct
but same value instances always returned false. In vim.pack.add this caused
redundant lockfile rewrites, even when the resulting lockfile content was
unchanged.

Solution: Add __eq metamethod on vim.VersionRange

runtime/lua/vim/version.lua

@@ -273,6 +273,9 @@ end
 
 local range_mt = {
   __index = VersionRange,
+  __eq = function(self, other)
+    return self.to == other.to and self.from == other.from
+  end,
   __tostring = function(self)
     if not self.to then
       return '>=' .. tostring(self.from)