[C++] FixedSizeListBuilder should have UnsafeAppend methods
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Component: C++
good-first-issue
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
The following methods are missing from `FixedSizeListBuilder` and would be useful for high-performance fixed-size-list array building:
* `void UnsafeAppend()`
* `void UnsafeAppendNull()`
* `void UnsafeAppendNulls(int64_t length)`
Ideally the PR should also grep through the source code and convert candidate call sites to the new APIs.
### Component(s)
C++
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