[Rust] [DataFusion] Don't allow bare_trait_objects

[asfimport]

Need to remove "#![allow(bare_trait_objects)]" from cargo.toml and fix compiler warnings

Reporter: Andy Grove / @andygrove
Assignee: Andy Grove / @andygrove

PRs and other links:

• GitHub Pull Request #5006

_{Note: This issue was originally created as ARROW-6104. Please see the migration documentation for further details.}

[asfimport]

Andy Grove / @andygrove:
Issue resolved by pull request 5006
#5006