[ruby-core:99474] [Ruby master Feature#17103] Add a :since option to ObjectSpace.dump_all

Issue #17103 has been reported by byroot (Jean Boussier).

----------------------------------------
Feature #17103: Add a :since option to ObjectSpace.dump_all
https://bugs.ruby-lang.org/issues/17103

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
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Patch: https://github.com/ruby/ruby/pull/3368

This is useful to see what a block of code allocated, e.g.

```ruby
GC.start
GC.disable
gc_gen = GC.count
ObjectSpace.trace_object_allocations do
  # run some code
end
allocations = ObjectSpace.dump_all(output: :file, since: gc_gen)
GC.enable
GC.start
retentions = ObjectSpace.dump_all(output: :file, since: gc_gen)
```

For context this is what I do in https://github.com/Shopify/heap-profiler, except I have to dump the entire three times, and then do a diff. This new API would allow me to dump the entire heap only once, and then do two much faster single generations dumps, and avoid having to do the diff.




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