feat: prefix the css class names

[Benehiko]

This PR simplifies class overrides by providing a prefix name for the generated CSS classes.

In this case we add a prefix ory_elements__ to each class name.

The format is as follows: ory_elements___<variant|size>__hash

Example generated classes:
ory_elements__button_social__i8n2ik0
ory_elements__button_social_size_medium__ecxsa2d
ory_elements__button_social_variant_semibold__xas31dg

See this discussion for more details
#162

Related Issue or Design Document

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
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• I have added tests that prove my fix is effective or that my feature works.
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Further comments

[Benehiko]

Without the hash doesn't work.

even playwright tests are failing since the UI elements aren't rendering properly. I'll add the hash back.