Handle aliases in path2uid

[cekk]

It's me..again ;)

This time, my edge-case is:

I have a parent Document (/aaa) with some contents inside it (/aaa/foo).
The parent have some text with an internal link to /aaa/foo that is stored in block data as a resolveuid string (correct).
Now, edit parent changing its id (from "aaa" to "bbb") and add some random text.
When you save the form, Volto sends to restapi the blocks with the link to foo like this: http://localhost:3000/aaa/foo.
restapi deserializer now try to resolve all links and convert them in resolveuid-like, but it is called after parent rename, so the path "/aaa/foo" is invalid and lead to store in the parent blocks a link like "http://localhost:3000/aaa/foo" that is potentially broken.

My pr add an additional check in path2uid method, to check also aliases for a given path.

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📚 Documentation preview 📚: https://plonerestapi--1848.org.readthedocs.build/

[mister-roboto]

@cekk thanks for creating this Pull Request and helping to improve Plone!

TL;DR: Finish pushing changes, pass all other checks, then paste a comment:

@jenkins-plone-org please run jobs

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass, but it takes 30-60 min. Other CI checks are usually much faster and the Plone Jenkins resources are limited, so when done pushing changes and all other checks pass either start all Jenkins PR jobs yourself, or simply add the comment above in this PR to start all the jobs automatically.

Happy hacking!

[cekk]

@jenkins-plone-org please run jobs