Fix addDays cause an error when used datetime64

[loneylee]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix the issue where the function addDays (and similar functions) reports an error when the first parameter is DateTime64.

DB::Exception: Illegal type DateTime64(6) of first argument of function addDays. Must be a DateTime: While processing addDays(toDateTime64('2024-01-01', 6), 10, 'Asia/Shanghai')

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

Not needed.

[robot-ch-test-poll4]

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