ARROW-11620: [Rust][DataFusion] Consistently use Arc<dyn TableProvider> rather than Box and Arc#9487

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alamb:alamb/arcd_table_provider

Commits on Feb 15, 2021

ARROW-11620: [Rust][DataFusion] Consistently use Arc<dyn TableProvider> rather than Box and Arc
alamb
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Return previously registered table provider, if any
alamb
committed