Fix DateTime query parameters around Unix epoch - #409
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Fixes #385 by using Decimal to encode fractional DateTime query parameters as exact, timezone-independent Unix values with preserved precision.
Adds encoding and ClickHouse tests for pre/post-epoch boundaries, scalar and array parameters, explicit and session timezones, and documents ClickHouse’s current behavior of parsing numeric values such as
-0.500000as+0.500000.Tested with
mix test(476 passing).