[Python] Random array generator for Arrow conversion and Parquet testing

[asfimport]

Reporter: Krisztian Szucs / @kszucs
Assignee: Krisztian Szucs / @kszucs

PRs and other links:

• GitHub Pull Request #3301

_{Note: This issue was originally created as ARROW-3903. Please see the migration documentation for further details.}

[asfimport]

Krisztian Szucs / @kszucs:
Issue resolved by pull request 3301
#3301