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Support update in unique data model #6229

Description

@EmmyMiao87

Doris does not support the update syntax.
Although the unique model can be updated by select + insert, this indirect method is inconvenient to use and cannot guarantee atomicity.
Supporting the update syntax can expand the usage scenarios of doris and improve the ease of use of the system.
For occasional updates, while supporting updates, it will not affect query performance.

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