DEV: (cmds) document new array data structure

[dwdougherty]

Redis 8.8 feature

This is the best I could do with what little information I had at my disposal (it wasn't much). I'm sure this will need more work before 8.8 GA.

Just docs team for reviews for now until I can identify another reviewer.

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Note

Low Risk
Primarily documentation and site metadata updates; the only functional impact is exposing a new array command group in the commands index/filter and adding command metadata that could affect docs generation.

Overview
Adds full documentation for the new Redis array data structure, including a new develop/data-types/arrays overview and reference pages for array commands like ARSET, ARGET, ARMSET, ARDEL, AROP, and related cursor/range helpers.

Updates site navigation and command metadata to surface arrays: data/commands_core.json gains the array command specs, the commands list UI adds an array group filter option, and various data-type index pages are reorganized/retitled (including bitmaps/bitfields doc path updates). Railroad diagrams are added for the new array commands.

^{Reviewed by Cursor Bugbot for commit a9df045. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

DOC-6500

[github-actions]

Staging links:
https://redis.io/docs/staging/DOC-6500/commands/arcount/
https://redis.io/docs/staging/DOC-6500/commands/ardel/
https://redis.io/docs/staging/DOC-6500/commands/ardelrange/
https://redis.io/docs/staging/DOC-6500/commands/arget/
https://redis.io/docs/staging/DOC-6500/commands/argetrange/
https://redis.io/docs/staging/DOC-6500/commands/arinfo/
https://redis.io/docs/staging/DOC-6500/commands/arinsert/
https://redis.io/docs/staging/DOC-6500/commands/arlastitems/
https://redis.io/docs/staging/DOC-6500/commands/arlen/
https://redis.io/docs/staging/DOC-6500/commands/armget/
https://redis.io/docs/staging/DOC-6500/commands/armset/
https://redis.io/docs/staging/DOC-6500/commands/arnext/
https://redis.io/docs/staging/DOC-6500/commands/arop/
https://redis.io/docs/staging/DOC-6500/commands/arring/
https://redis.io/docs/staging/DOC-6500/commands/arscan/
https://redis.io/docs/staging/DOC-6500/commands/arseek/
https://redis.io/docs/staging/DOC-6500/commands/arset/
https://redis.io/docs/staging/DOC-6500/develop/data-types/
https://redis.io/docs/staging/DOC-6500/develop/data-types/arrays/
https://redis.io/docs/staging/DOC-6500/develop/data-types/compare-data-types/
https://redis.io/docs/staging/DOC-6500/develop/data-types/geospatial/
https://redis.io/docs/staging/DOC-6500/develop/data-types/hashes/
https://redis.io/docs/staging/DOC-6500/develop/data-types/json/
https://redis.io/docs/staging/DOC-6500/develop/data-types/lists/
https://redis.io/docs/staging/DOC-6500/develop/data-types/probabilistic/
https://redis.io/docs/staging/DOC-6500/develop/data-types/probabilistic/count-min-sketch/
https://redis.io/docs/staging/DOC-6500/develop/data-types/probabilistic/cuckoo-filter/
https://redis.io/docs/staging/DOC-6500/develop/data-types/probabilistic/hyperloglogs/
https://redis.io/docs/staging/DOC-6500/develop/data-types/probabilistic/t-digest/
https://redis.io/docs/staging/DOC-6500/develop/data-types/probabilistic/top-k/

[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

[mich-elle-luna]

thank you!

[dwdougherty]

Thanks for the review, @mich-elle-luna!

[mich-elle-luna]

Actually, do we have a way to put a banner on these pages? Like we did initially for vector sets?

[dwdougherty]

Will do.