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ARROW-7787: [Rust] Added .collect to Table API

This commit adds the method ".collect" to Table, thus
reducing the code necessary to execute a query constructed
from the Table API.

This also adds an example to the examples on how to use the Table API on a table declared in-Memory.

Closes #6375 from jorgecarleitao/table_collect and squashes the following commits:

8a6efaa33 <Jorge C. Leitao> ARROW-7787:  Added .collect to Table API

Authored-by: Jorge C. Leitao <jorgecarleitao@gmail.com>
Signed-off-by: Andy Grove <andygrove73@gmail.com>