Replace bucketed map with parallel_hash_map

[murphyatwork]

Refactoring request

Is your refactoring request related to a problem? Please describe.

Current code in BE implement thread-safe hash map with bucketed strategy many times, which is trivial and redundant.

That could be replaced with phmap::parallel_flat_hash_map with a bucket parameter and a mutex, which is more clear.

Describe the solution you'd like

Describe alternatives you've considered

Additional context

[github-actions]

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