add lint for recreation of an entire struct

[phi-gamma]

This lint makes Clippy warn about situations where an owned struct is essentially recreated by moving all its fields into a new instance of the struct. The lint is not machine-applicable because the source struct may have been partially moved.

This lint originated in something I spotted during peer review. While working on their branch a colleague ended up with a commit where a function returned a struct that 1:1 replicated one of its owned inputs from its members. Initially I suspected they hadn’t run their code through Clippy but AFAICS there is no lint for this situation yet.

changelog: new lint: [redundant_owned_struct_recreation]

New lint checklist

• [+] Followed [lint naming conventions][lint_naming]
• [+] Added passing UI tests (including committed .stderr file)
• [+] cargo test passes locally
• [+] Executed cargo dev update_lints
• [+] Added lint documentation
• [+] Run cargo dev fmt