feat: add Ory Kratos authentication scripts

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Description

I added two authentication scripts to enable authenticated interactions with web applications relying on Ory Kratos.

• KratosApiAuthentication.js adds support for the Native Login flow
• KratosABrowserAuthentication.js adds support for the Browser Login flow

I hope they may be useful for others in the Zap community.

[thc202]

The commits need to be signed-off: https://github.com/zaproxy/community-scripts/pull/447/checks?check_run_id=25640107047
You need to run the spotlessApply task (e.g. ./gradlew sA) to fix the formatting of the scripts.
The changelog should be updated to mention the new scripts: https://github.com/zaproxy/community-scripts/blob/main/CONTRIBUTING.md#changelog

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The commits need to be signed-off: https://github.com/zaproxy/community-scripts/pull/447/checks?check_run_id=25640107047 You need to run the spotlessApply task (e.g. ./gradlew sA) to fix the formatting of the scripts. The changelog should be updated to mention the new scripts: https://github.com/zaproxy/community-scripts/blob/main/CONTRIBUTING.md#changelog

Sorry, I missed the contribution guidelines. Too bad I had to remove my GPG signature ;)
Should be good now!

[thc202]

You can still sign the commits.

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Yes, but not during the rebase unfortunately.

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@thc202 Can you help for the reviewing of this PR? Is anything blocking?

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@thc202 Just applied your suggestions.

[thc202]

Thank you!