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[9.20] chg: dev: Optimize memory layout of core structs

bind-team-rw-api-rw-repo requested to merge backport-5022-reduce-metadata-overhead-by-struct-packing-9.20 into bind-9.20

Reduce memory footprint by:

  • Reordering struct fields to minimize padding.
  • Using exact-sized atomic types instead of *_least/*_fast variants
  • Downsizing integer fields where possible

Affected structs:

  • dns_name_t
  • dns_slabheader_t
  • dns_rdata_t
  • qpcnode_t
  • qpznode_t

Closes #5022 (closed)

Backport of MR !9721 (merged)

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