ARROW-3713: [Rust] Implement BinaryArrayBuilder
ARROW-3713: [Rust] Implement BinaryArrayBuilder

Builds on [ARROW-3644](https://github.com/apache/arrow/pull/2914) and [ARROW-3787](https://github.com/apache/arrow/pull/2957).

Author: Paddy Horan <paddyhoran@hotmail.com>

Closes #2968 from paddyhoran/ARROW-3713 and squashes the following commits:

c565cdca <Paddy Horan> Implementation of `BinaryArrayBuilder`

majetideepak/arrow,cpcloud/arrow,xhochy/arrow,cpcloud/arrow,kou/arrow,tebeka/arrow,majetideepak/arrow,pcmoritz/arrow,icexelloss/arrow,cpcloud/arrow,kou/arrow,cpcloud/arrow,itaiin/arrow,majetideepak/arrow,majetideepak/arrow,icexelloss/arrow,renesugar/arrow,pcmoritz/arrow,itaiin/arrow,apache/arrow,laurentgo/arrow,renesugar/arrow,pcmoritz/arrow,laurentgo/arrow,majetideepak/arrow,cpcloud/arrow,itaiin/arrow,icexelloss/arrow,icexelloss/arrow,xhochy/arrow,laurentgo/arrow,wesm/arrow,wesm/arrow,apache/arrow,renesugar/arrow,kou/arrow,pcmoritz/arrow,pcmoritz/arrow,tebeka/arrow,apache/arrow,wesm/arrow,icexelloss/arrow,apache/arrow,kou/arrow,icexelloss/arrow,renesugar/arrow,wesm/arrow,apache/arrow,xhochy/arrow,pcmoritz/arrow,itaiin/arrow,xhochy/arrow,pcmoritz/arrow,laurentgo/arrow,wesm/arrow,wesm/arrow,cpcloud/arrow,renesugar/arrow,apache/arrow,kou/arrow,laurentgo/arrow,pcmoritz/arrow,tebeka/arrow,wesm/arrow,wesm/arrow,cpcloud/arrow,tebeka/arrow,laurentgo/arrow,laurentgo/arrow,laurentgo/arrow,pcmoritz/arrow,xhochy/arrow,renesugar/arrow,xhochy/arrow,laurentgo/arrow,cpcloud/arrow,icexelloss/arrow,tebeka/arrow,apache/arrow,apache/arrow,majetideepak/arrow,icexelloss/arrow,wesm/arrow,majetideepak/arrow,majetideepak/arrow,itaiin/arrow,icexelloss/arrow,tebeka/arrow,majetideepak/arrow,renesugar/arrow,itaiin/arrow,pcmoritz/arrow,majetideepak/arrow,tebeka/arrow,kou/arrow,wesm/arrow,majetideepak/arrow,apache/arrow,wesm/arrow,kou/arrow,laurentgo/arrow,pcmoritz/arrow,tebeka/arrow,xhochy/arrow,laurentgo/arrow,icexelloss/arrow,kou/arrow,tebeka/arrow,kou/arrow,itaiin/arrow,wesm/arrow,xhochy/arrow,laurentgo/arrow,apache/arrow,kou/arrow,itaiin/arrow,renesugar/arrow,itaiin/arrow,icexelloss/arrow,itaiin/arrow,cpcloud/arrow,laurentgo/arrow,itaiin/arrow,xhochy/arrow,kou/arrow,icexelloss/arrow,kou/arrow,renesugar/arrow,renesugar/arrow,xhochy/arrow,wesm/arrow,xhochy/arrow,cpcloud/arrow,xhochy/arrow,pcmoritz/arrow,renesugar/arrow,apache/arrow,cpcloud/arrow,kou/arrow,pcmoritz/arrow,xhochy/arrow,majetideepak/arrow,itaiin/arrow,xhochy/arrow,icexelloss/arrow,cpcloud/arrow,laurentgo/arrow,laurentgo/arrow,pcmoritz/arrow,apache/arrow,majetideepak/arrow,cpcloud/arrow,itaiin/arrow,itaiin/arrow,majetideepak/arrow,wesm/arrow,majetideepak/arrow,renesugar/arrow,icexelloss/arrow,itaiin/arrow,tebeka/arrow,renesugar/arrow,kou/arrow,xhochy/arrow,renesugar/arrow,apache/arrow,cpcloud/arrow,apache/arrow,pcmoritz/arrow,renesugar/arrow