Return type of quantileExact* functions

[kudrevatykh]

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Describe the issue

Documentation says that return type of quantileExact is Float64, Date or DateTime. https://github.com/ClickHouse/ClickHouse/blob/master/docs/en/sql-reference/aggregate-functions/reference/quantileexact.md

But actually return type of function depends on type of expression argument.
to check this you can run following query

SELECT toTypeName(quantileExact(number)),toTypeName(quantileExact(cast (number as int))), toTypeName(quantileExact(cast (number as float))) FROM numbers(10)

Additional context

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