Added an ability to specify CSV ouput encoding

[Lupennat]

1️⃣ Why should it be added? What are the benefits of this change?
sometimes it is necessary to be able to export a CSV file directly with an encoding different from UTF-8

2️⃣ Does it contain multiple, unrelated changes? Please separate the PRs out.
No

3️⃣ Does it include tests, if possible?
Yes

4️⃣ Any drawbacks? Possible breaking changes?
No, the default is 'UTF-8'

5️⃣ Mark the following tasks as done:

• Checked the codebase to ensure that your feature doesn't already exist.
• Take note of the contributing guidelines.
• Checked the pull requests to ensure that another person hasn't already submitted a fix.
• Added tests to ensure against regression.
• Updated the changelog

6️⃣ Thanks for contributing! 🙌

[patrickbrouwers]

Thanks 👍