feat(time-series): add TS.NRANGE and TS.NREVRANGE multi-key pivot commands

[nkaradzhov]

This pull request adds the TS.NRANGE and TS.NREVRANGE RedisTimeSeries commands (Redis 8.10). Both query an explicit list of time series keys over a timestamp range and return timestamp-major pivot rows { timestamp, values }, where values preserves the input key order and missing cells surface as NaN (indistinguishable from a stored/aggregated NaN, matching the server contract). TS.NRANGE returns rows in increasing-timestamp order; TS.NREVRANGE in decreasing order, reusing the same argument builder and reply parser without re-sorting server rows.

Key behaviors:

• numkeys is derived from the key list and duplicate keys are preserved (duplicates map to repeated value columns).
• Full TS.RANGE-style option set: LATEST, FILTER_BY_TS, FILTER_BY_VALUE, COUNT, ALIGN, AGGREGATION, BUCKETTIMESTAMP, EMPTY.
• Aggregation takes one aggregator per key emitted as separate tokens (AGGREGATION first max min ...), never the comma-joined form.
• Single-shard, key-routed (no multi_shard policy); same-slot key requirement documented in JSDoc.

Exposed as NRANGE/nRange and NREVRANGE/nRevRange. A shared pivot-row reply transform lives in helpers.ts. Behavior verified against a live Redis 8.10 instance.

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Note

Low Risk
Additive read-only commands plus a small dedupe refactor of range argument parsing; behavior covered by unit and integration tests against Redis 8.10.

Overview
Adds Redis 8.10 client support for TS.NRANGE and TS.NREVRANGE, exposed as nRange / nRevRange. Both take an explicit key list (with numkeys from length, duplicates preserved), a time range, and optional TS.RANGE-style filters; replies are timestamp-major pivot rows { timestamp, values[] } aligned to key order, with missing cells as NaN via transformPivotSamplesReply.

TS.NRANGE builds wire args including one aggregator token per key under AGGREGATION (not the comma-joined form used by single-key multi-agg). TS.NREVRANGE reuses the same argument builder and reply parser, only changing the command name.

Refactor: shared range preamble (LATEST, FILTER_BY_TS, FILTER_BY_VALUE, COUNT) moves into parseRangeCommonArguments / TsRangeCommonOptions in helpers.ts, used by existing RANGE and RANGE_MULTIAGGR parsers without changing their aggregation wire format.

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