new feature: rename allow_anonymous to skip_signature

[Xuanwo]

Feature Description

Rename the user-facing allow_anonymous option used by S3-compatible services to skip_signature.

The intended behavior is explicit: when this option is enabled, OpenDAL sends requests without loading credentials and without signing requests. allow_anonymous should be kept as a deprecated compatibility alias during migration where the old surface is still preserved.

Status

Completed core service work:

• services/s3: skip_signature is the primary builder/config option; allow_anonymous is kept as a deprecated compatibility alias. Completed by feat(services/s3): Rename allow_anonymous to skip_signature #7544.
• services/oss: skip_signature is the primary builder/config option; allow_anonymous is kept as a deprecated compatibility alias. Completed by feat(services/oss): Rename allow_anonymous to skip_signature #7556.
• services/tos: renamed to skip_signature and updated signing behavior. Completed by feat(services/tos): Rename allow_anonymous to skip_signature #7566. Note: the old TOS allow_anonymous surface was removed instead of kept as a compatibility alias.
• services/gcs: skip_signature is the primary builder/config option, allow_anonymous is kept as a deprecated compatibility alias, and the behavior now unconditionally skips credential loading and request signing. Completed by feat(services/gcs): Rename allow_anonymous to skip_signature #7567.

Completed generated and integration surfaces:

• object_store_opendal S3 conversion maps object_store SkipSignature to OpenDAL skip_signature. Completed by feat(services/s3): Rename allow_anonymous to skip_signature #7544.
• Python and Java generated service config surfaces expose skip_signature for the affected services. Completed across feat(services/s3): Rename allow_anonymous to skip_signature #7544, feat(services/oss): Rename allow_anonymous to skip_signature #7556, feat(services/tos): Rename allow_anonymous to skip_signature #7566, and feat(services/gcs): Rename allow_anonymous to skip_signature #7567.
• .NET service config surfaces expose skip_signature for gcs, oss, and s3. Completed across feat(services/s3): Rename allow_anonymous to skip_signature #7544, feat(services/oss): Rename allow_anonymous to skip_signature #7556, and feat(services/gcs): Rename allow_anonymous to skip_signature #7567. There is currently no generated .NET TosServiceConfig surface.

Remaining tasks:

• Update upgrade notes and service docs for the rename and compatibility behavior. Current upgrade.md still only contains the old allow_anonymous note, and only OSS service docs mention the new skip_signature option explicitly.

References

• feat(services/s3): Rename allow_anonymous to skip_signature #7544
• feat(services/oss): Rename allow_anonymous to skip_signature #7556
• feat(services/tos): Rename allow_anonymous to skip_signature #7566
• feat(services/gcs): Rename allow_anonymous to skip_signature #7567

Are you willing to contribute to the development of this feature?

• Yes, I am willing to contribute to the development of this feature.

[YuangGao]

hi @Xuanwo, i'm happy to take this or part of this if you need help — just let me know

[Xuanwo]

hi @Xuanwo, i'm happy to take this or part of this if you need help — just let me know

Thank you! Welcome to finish this tracking issues.