Add rank_zero_only(..., default=) argument
#187
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What does this PR do?
When using
rank_zero_only, one might want to return a default object to avoid type errors on non-zero ranks.Implemented in https://github.com/Lightning-AI/lightning/pull/18848/files#diff-ac4de1893b3d5f27cf2fb2c29c4fffbeee29c7e8bf42c101d5366867fff79ac0R56-R77
馃摎 Documentation preview 馃摎: https://lit-utilities--187.org.readthedocs.build/en/187/