devel/croaring: Roaring bitmaps in C (and C++), with SIMD

Roaring bitmaps in C (and C++), with SIMD (AVX2, AVX-512 and NEON)
optimizations: used by Apache Doris, ClickHouse, Alibaba Tair, Redpanda, YDB
and StarRocks.

WWW: http://roaringbitmap.org/

• update port to 5.2.0 prior to landing
• grab maintainership over submitter as I have a good relationship to upstream
• lightly touch up

PR: 292270
Event: EuroBSDcon Devsummit 2026
See also: https://github.com/RoaringBitmap/CRoaring/pull/879