feat: support for Pekko Streams in the scala client

[utkuaydn]

Closes #660

Proposed Changes

Support for Pekko Streams in the scala client

Checklist

• [x] CHANGELOG.md updated
• [x] Rebased/mergeable
• [x] A test has been added if appropriate
• [x] mvn test completes successfully
• [x] Commit messages are conventional
• [x] Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (fd604f8) 88.35% compared to head (aeea943) 88.37%.

:exclamation: Current head aeea943 differs from pull request most recent head 2b3d34a. Consider uploading reports for the commit 2b3d34a to get more accurate results

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #661 +/- ## ============================================ + Coverage 88.35% 88.37% +0.01% Complexity 777 777 ============================================ Files 173 173 Lines 7078 7078 Branches 393 393 ============================================ + Hits 6254 6255 +1 + Misses 699 698 -1 Partials 125 125 ```

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[utkuaydn]

Hi @bednar

It is my pleasure to be able to contribute. I have removed everything Akka-related per your request. The only edit on your part would have to be the date on the changelog since I do not know when you will be releasing this. Do let me know if anything needs changing.

[utkuaydn]

Hi @bednar,

I've completed the checklist and rebased the commit 👍

[reyrobs]

Well done Utku!