Auto merge of #100748 - SparrowLii:query_depth, r=cjgillot

add `depth_limit` in `QueryVTable` to avoid entering a new tcx in `layout_of`

Fixes #49735
Updates #48685

The `layout_of` query needs to check whether it overflows the depth limit, and the current implementation needs to create a new `ImplicitCtxt` inside `layout_of`. However, `start_query` will already create a new `ImplicitCtxt`, so we can check the depth limit in `start_query`.

We can tell whether we need to check the depth limit simply by whether the return value of `to_debug_str` of the query is `layout_of`. But I think adding the `depth_limit` field in `QueryVTable` may be more elegant and more scalable.

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