[8.0](backport #28926) libbeat: add support for defining analyzers in-line in fields.yml files

[mergify]

This is an automatic backport of pull request #28926 done by Mergify.

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[elasticmachine]

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[efd6]

/test

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/8.0/pr-28926 upstream/mergify/bp/8.0/pr-28926
git merge upstream/8.0
git push upstream mergify/bp/8.0/pr-28926