ARROW-7813: [Rust] Remove and fix unsafe code#6395

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Marwes wants to merge 20 commits intoapache:masterfrom

Marwes:unsafe_rust_2

Commits on Apr 14, 2020

Better error message for missing test data
Markus Westerlind
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fix: murmur hash is only safe on platforms with unaligned loads
Markus Westerlind
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fix: Use safe code to read types in bit_util
Markus Westerlind
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Remove unnecessary unsafe in memcpy functions
Markus Westerlind
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fix: Don't allow arbitrary transmutes when decoding
Markus Westerlind
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Remove unnecessary unsafe in Int96 construction
Markus Westerlind
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fix: Don't trust parquet data to be UTF-8
Markus Westerlind
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refactor: Remove unnecessary unsafe in decoding
Markus Westerlind
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fix: Restrict which types can be transmuted to byte slices
Markus Westerlind
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refactor: Remove unnecessary unsafe from rle encoding
Markus Westerlind
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fix: Prevent aliasing of &mut with FatPtr by threading lifetimes
Markus Westerlind
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fix: Don't alias &mut from bit_writer
Markus Westerlind
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refactor: Avoid unsafe in put
Markus Westerlind
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refactor: Avoid unsafe when casting RecordReader
Markus Westerlind
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refactor: Move unsafe into MutableBuffer
Markus Westerlind
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fix: Don't create a slice from a null pointer when calling Buffer::data
Markus Westerlind
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refactor: No need for unsafe in Debug impl for Buffer
Markus Westerlind
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Fix fn data
Markus Westerlind
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Fix non-simd compilation
Markus Westerlind
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Fix bluss's review comments
Markus Westerlind
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