v1.5.0

[aosingh]

This PR adds cross-schema sharing support and request-level profile attribute overrides for Select AI.

• Add grant/revoke access APIs for users and roles
• Add owner-aware profile and vector index lookup/listing through ALL_CLOUD_* views.
• Add owner and qualified_name metadata to profiles and vector indexes.
• Add optional public synonym creation and deletion for credentials.
• Add additional_instructions to ProfileAttributes.
• Add per-request attributes mappings to DBMS_CLOUD_AI.GENERATE calls, including action helpers, sessions, and async pipelines.