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Add Trivial Merge Selector Algorithm for Professional Use

Add a new merge selector algorithm, named Trivial, for professional usage only. It is worse than the Simple merge selector. #70969 (Alexey Milovidov).
Introduces a new merge selector algorithm named Trivial, designed for professional usage within ClickHouse.

Why it matters

The Trivial merge selector algorithm provides an alternative to the existing Simple merge selector. Although it performs worse than Simple, it may be useful for specialized or professional scenarios where different merge behaviors are required.

How to use it

Users can enable the Trivial merge selector by specifying it in the appropriate merge selector configuration or setting within ClickHouse where merge selector algorithms are chosen.