arrayFold: Switch accumulator and array arguments

[rschu1ze]

The lambda argument of function arrayFold now requires the accumulator as the first argument. This makes the semantics more similar to other languages, e.g.

• Python: https://docs.python.org/3/library/functools.html#functools.reduce
• JS: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce
• C++: https://en.cppreference.com/w/cpp/algorithm/accumulate

"Not for changelog" because arrayFold is new and not in any released version yet.

Changelog category (leave one):

• Not for changelog (changelog entry is not required)

[robot-clickhouse-ci-1]

This is an automated comment for commit 68c3f41 with description of existing statuses. It's updated for the latest CI running

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[rschu1ze]

Relevant change.

[rschu1ze]

Relevant change.