feat: use hashbrown instead of ahash

[utkarshgupta137]

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feat

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Switch from ahash to hashbrown. These has 2 benefits:

• ahash uses std::collections::HashMap which is also based on hashbrown, but the hashbrown crate itself usually has a newer version of the hash table & uses more aggressive inline by default
• hashbrown uses foldhash as the default hasher, which has shown to be slightly better or equal to ahash & foldhash has better support on a wider range of platforms