feat(client): add Redis 8.8 array commands

[nkaradzhov]

Adds support for the 19-command AR* family introduced in Redis 8.8: ARSET, ARGET, ARGETRANGE, ARMSET, ARMGET, ARLEN, ARCOUNT, ARNEXT, ARINFO, ARDEL, ARDELRANGE, ARSCAN, ARGREP (+WITHVALUES), ARINSERT, ARRING, ARSEEK, ARLASTITEMS, AROP.

Notable design choices:

• All index inputs accept number | string so callers can pass decimal strings for indices above Number.MAX_SAFE_INTEGER (the server's index space is uint64). Output-side precision is delegated to the existing codebase-wide escape hatch: client.withTypeMapping({ [RESP_TYPES.NUMBER]: String }), with @remarks pointing at it on every AR* command that may return a large index.
• ARGREP accepts the open-ended bounds '-' and '+' in addition to numeric indices, in any combination.

Description

Describe your pull request here

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Checklist

• Does npm test pass with this change (including linting)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?

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Note

Medium Risk
Adds a large new surface area of Redis commands and associated typings/transformers, which could introduce API/typing mismatches or reply-shape bugs despite being largely additive and version-gated.

Overview
Adds client support for the Redis 8.8 AR* “array” command family, wiring new command builders into packages/client/lib/commands/index.ts and exposing them via the public client API (e.g. client.arSet, client.arGrep, client.arOp).

Introduces argument/option typing for array indices (supporting number | string, plus '-'/'+' bounds for ARGREP) and exports new constants (AR_PREDICATE_TYPES, AR_PREDICATE_COMBINATORS, AR_OPERATIONS) from both lib/commands and the package entrypoint.

Adds extensive unit/integration tests for the new commands (including edge cases like sparse arrays, cursor behavior, modifier ordering, and server-side error validation), gated to Redis versions >= 8.8.

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[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

^{Reviewed by Cursor Bugbot for commit e3450bc. Configure here.}

[bobymicroby]

lgtm