* feat!: dag import - don't pin roots by default
Fixes: https://github.com/ipfs/kubo/issues/9765
* test(ipip-402): dag import
this adds basic regression test that guards behavior
around partial cars with or without pinning
* docs(ipip-402): ipip and dag import changelog
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Co-authored-by: Marcin Rataj <lidel@lidel.org>