This pull request introduces support for specifying access levels ('public' or 'private') when uploading blobs, with initial implementation for S3 and partial handling for other drivers. It updates the documentation, types, and driver logic to accommodate this feature, while ensuring backward compatibility and providing clear warnings or errors for unsupported configurations.

Access Level Support for Blob Uploads

• Added an access field to BlobPutOptions and BlobMultipartOptions types, allowing users to specify 'public' or 'private' access when uploading blobs. [1] [2]
• Updated documentation (docs/content/docs/2.features/0.blob.md) to describe the new access option, noting that only the S3 driver currently supports it.

S3 Driver Enhancements

• Implemented support for the access option in the S3 driver: setting 'public' adds the appropriate ACL header (x-amz-acl: public-read) to make the blob public.
• Adjusted S3 driver configuration logic to better handle optional endpoint and region settings, improving compatibility with S3-compatible services. [1] [2]

Other Driver Handling

• For Cloudflare R2, added a warning if the access option is used, indicating that access level is not supported and will be ignored.
• For Vercel Blob, added an error if 'private' access is requested, as this is not yet supported.