New lint: [`duplicate_map_keys`]#12575

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SeseMueller wants to merge 8 commits intorust-lang:masterfrom

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Commits on Mar 27, 2024

Implemented first lint configuration. More work for more complex cases to follow
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Fixed cargo test not passing; minor changes
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Update lint description
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removed trailing whitespace
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Commits on Mar 28, 2024

Changed lint name to duplicate_map_keys
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Commits on Mar 29, 2024

Improved lint text and added tests. It only matches literals currently, so that needs to change
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made test for duplicate keys more precise (also works on non-literals now)
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Changed tests around, false negative now works as expected
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