feat: add Identity message, service and client

[markgoddard]

This change adds an Identity message, an IdentityService gRPC service and an IdentityClient to the Connect client. Identity represents a SPIFFE workload identity with corresponding SPIRE selectors that define the attestation criteria. The gRPC service provides GetIdentity and ListIdentities RPCs.

[github-actions]

The latest Buf updates on your PR. Results from workflow buf-ci / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jun 27, 2025, 4:30 PM

[gemini-code-assist]

Summary of Changes

Hello @markgoddard, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the foundational components for managing identities within the system. It defines the Identity message, the IdentityService for accessing and managing identities, and integrates the new service into the client SDK.

Highlights

• Identity Message: Adds the Identity message, which includes fields for ID, organization ID, trust zone ID, cluster ID, attestation policy ID, AP binding ID, workload ID, SPIFFE ID, parent ID, selectors, federations, and creation timestamp.
• Identity Service: Introduces the IdentityService with GetIdentity and ListIdentities RPCs for retrieving individual identities and listing identities with filtering.
• Connect Client: Adds the Identity client to the ClientSet for interacting with the Identity service.

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[gemini-code-assist]

Code Review

This pull request introduces the IdentityService and its corresponding client. The protobuf definitions are clear, and the client implementation is straightforward. There's one minor issue with an inaccurate comment in the new client implementation.