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add extend_dictionary in dictionary builder for improved performance #6875

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Which issue does this PR close?

No issue

Rationale for this change

This is done to improve the performance when wanting to add already build dictionary to existing builder by taking advantage of the fact that we don't need to check the values for each key

What changes are included in this PR?

added extend_dictionary for PrimitiveDictionaryBuilder and for GenericByteDictionaryBuilder

Are there any user-facing changes?

yes, these are public methods

@github-actions github-actions bot added the arrow Changes to the arrow crate label Dec 12, 2024
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