[v26.2.x] Port chunked_vector, chunked_hash_map, and use it in prometheus-impl.hh - #289

[v26.2.x] Port chunked_vector, chunked_hash_map, and use it in prometheus-impl.hh#289

WillemKauf merged 5 commits into

redpanda-data:v26.2.xredpanda-data/seastar:v26.2.xfrom

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