[C++][Gandiva] Implement split function in gandiva

Create a function to split a line of text using a particular delimiter, and return a particular substring

**Reporter**: [Daniel C Barnett](https://issues.apache.org/jira/browse/ARROW-9620)
#### PRs and other links:
- [GitHub Pull Request #7883](https://github.com/apache/arrow/pull/7883)

_{**Note**: *This issue was originally created as [ARROW-9620](https://issues.apache.org/jira/browse/ARROW-9620). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*}

Start by reviewing GitHub pull request #7883, which is linked from the issue and appears to cover the requested Gandiva split function. Confirm that the function splits a line using a delimiter and returns the requested substring, then verify the relevant tests or behavior described there.

Written by the indexing model from the issue text.