Add toma comments to auto_scale_batch_size

[BlackHC]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?
• If you made a notable change (that affects users), did you update the CHANGELOG?

What does this PR do?

Add links to toma in the auto_scale_batch_size as discussed in #1638.
Also, (for me as copyright holder) grant license for the used source code for this project under its own license instead of toma's MIT license.

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

👍

[codecov]

Codecov Report

Merging #1994 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1994   +/-   ##
======================================
  Coverage      88%     88%           
======================================
  Files          74      74           
  Lines        4641    4641           
======================================
  Hits         4064    4064           
  Misses        577     577           

[mergify]

Great job! =)