Custom csv delimiter

[jennweir]

Pull Request

Related issue

Addresses #590

What does this PR do?

• Includes csvDelimiter parameter in the addDocuments method
• Includes csvDelimiter parameter in the updateDocuments method

Issue #590 has two subtasks as listed below:

• Add the new argument to the csv document handler methods
• Add tests
• Tests are not included because there are some clarifications that we require to verify if the issue is already partially/completely implemented. After adding the csvDelimiter to each method, we researched adding a custom csv delimiter in Java and found no built-in support. Would this be best completed by utilizing an external library like OpenCSV?
• This PR addresses the function parameter additions to support a custom csvDelimiter if necessary but does not adequately test the functionality of these additions.
• It is unclear from the issue if this is already implemented, this would address the first subtask for Configure the CSV delimiter when updating documents #590 if the issue has not been implemented yet.

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
• Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!

[curquiza]

thank you @jennweir

ok for the tests

bors merge

[meili-bors]

Build succeeded:

• integration-and-unit-tests
• linter