Implement array_element function

[izveigor]

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Summary

Characteristic	Description
Function name:	array_element
Aliases:	array_extract, list_element, list_extract, array[i]
Original function?:	No
Function Description:	Clickhouse: Get the element with the index n from the array arr. n must be any integer type. Indexes in an array begin from one. Negative indexes are supported. In this case, it selects the corresponding element numbered from the end. For example, arr[-1] is the last item in the array. If the index falls outside of the bounds of an array, it returns some default value (0 for numbers, an empty string for strings, etc.), except for the case with a non-constant array and a constant index 0 (in this case there will be an error Array indices are 1-based). DuckDB: Extract the indexth (1-based) value from the list.
Sources:	Concept ClickHouse DuckDB

Examples:

select array_element([1, 2, 3, 4], 3);
----
3

select array_element([1, 2, 3, 4], 1);
----
1

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