ARROW-10969: [Rust][DataFusion] Implement basic String ANSI SQL Functions#8966

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seddonm1 wants to merge 5 commits intoapache:masterfrom

seddonm1:basic-string-functions

Commits on Dec 19, 2020

add basic string functions
seddonm1
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Commits on Dec 20, 2020

Commits on Dec 21, 2020

major simplification based on feedback
seddonm1
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