[TS] Add support for NaN values and new aggregations

[uglide]

Adds support for RedisTimeSeries/RedisTimeSeries#1853

[uglide]

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[augmentcode]

🤖 Augment PR Summary

Summary: Adds TimeSeries support for NaN-aware aggregations introduced in RedisTimeSeries PR #1853.

API: Extends TsAggregation with CountNan and CountAll and updates shipped API surface.

Command building: Adds literal mappings (countnan, countall) in AggregationExtensions for request/response conversion.

Tests: Adds sync/async TS.RANGE coverage asserting COUNTNAN returns 2 and COUNTALL returns 5 for mixed data.

Compatibility: Tests are gated on Redis server version to avoid running on unsupported environments.

Notes: Ensure the minimum Redis version used in gates matches the feature’s actual availability.

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[augmentcode]

Review completed. 2 suggestions posted.

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[mgravell]

API change looks good; CI says

Key has MOVED to Endpoint 127.0.0.1:16379 and hashslot 1691 but CommandFlags.NoRedirect was specified - redirect not followed for TS.RANGE.