Add tolerations

[AlekJaworski]

Description

For my own use I needed to be able to specify tolerations when defining kubeflow pipelines via the kedro config. So this is the functionality I have added.

Resolves: This is a proposed new functionality

PR Checklist

• [ x ] Tests added
• [x] Changelog updated

[marrrcin]

Please update

• changelog
• example default config (with empty tolerations)
• docs with an example usage

[em-pe]

Looks good, the only thing is failing flake and formatters. Install pre-commit with pip and run pre-commit run --all-files