RSCBC-200: Add support for JWT authentication

[chvck]

No description provided.

[Copilot]

Pull request overview

This PR adds support for JWT authentication in the Couchbase SDK by introducing a new JwtAuthenticator variant alongside the existing PasswordAuthenticator and CertificateAuthenticator.

Key Changes:

• Added JwtAuthenticator enum variant and implementation with OAuth Bearer token support
• Refactored HTTP authentication to use an Auth enum that supports both BasicAuth and BearerAuth
• Modified authentication mechanism handling to automatically derive supported mechanisms from authenticator types
• Simplified TLS configuration by auto-creating default TLS config when using couchbases:// scheme

Reviewed changes

Copilot reviewed 30 out of 30 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
sdk/couchbase/src/authenticator.rs	Added JwtAuthenticator struct and enum variant, removed unused UserPassPair and get_credentials method
sdk/couchbase/src/options/cluster_options.rs	Updated TLS config handling to support JWT auth and auto-create TLS config for secure connections
sdk/couchbase/src/clients/cluster_client.rs	Added automatic TLS config creation for couchbases:// scheme
sdk/couchbase-core/src/authenticator.rs	Added JwtAuthenticator with auth mechanism support
sdk/couchbase-core/src/auth_mechanism.rs	Added OAuthBearer authentication mechanism
sdk/couchbase-core/src/httpx/request.rs	Added BearerAuth struct and Auth enum variant for JWT tokens
sdk/couchbase-core/src/httpcomponent.rs	Refactored to use Auth enum, extracted auth_from_authenticator helper function
sdk/couchbase-core/src/memdx/*	Added SASL OAuth Bearer operation support and refactored credential handling
sdk/couchbase-core/src/kvclient.rs	Updated bootstrap authentication to derive mechanisms from authenticator type
sdk/couchbase-core/src/agent.rs	Simplified auth mechanism default logic and updated HTTP config fetching to use Auth enum
Multiple management/query/search files	Replaced separate username/password fields with unified auth field

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 45 out of 45 changed files in this pull request and generated 6 comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.