Added generatedAt field to SsvcObjectRegistry

[sei-vsarvepalli]

This pull request introduces a new timestamp field to the SsvcObjectRegistry class to record when the registry was generated. This helps track the creation time of registry data in a standardized format.

Enhancement to registry metadata:

• Added a generatedAt field to the SsvcObjectRegistry class, which automatically sets an RFC 3339-compliant UTC timestamp when the registry is generated.
• Imported datetime and timezone from the standard library to support timestamp generation.

Attempt to resolve #1219 with a feature that will provide timestamp of the latest release of SSVC objects.

[Copilot]

🟡 Changes recommended

The new timestamp is currently tied to registry instantiation (singleton) rather than generation/serialization time, and the schema should enforce the RFC 3339 shape via format: date-time.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR adds generation-time metadata to the SSVC object registry so consumers can tell when the registry data was produced.

Changes:

• Added a new generatedAt timestamp field to SsvcObjectRegistry.
• Updated the corresponding JSON Schema to include the new property.
• Regenerated the published data/json/ssvc_object_registry.json to include generatedAt.

File summaries

File	Description
src/ssvc/registry/base.py	Introduces the generatedAt field on the registry model (timestamp generation behavior).
data/schema/v2/SsvcObjectRegistry_2_0_0.schema.json	Adds generatedAt to the published JSON Schema for registry validation.
data/json/ssvc_object_registry.json	Updates the checked-in registry JSON to include the new metadata field.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 2
• Review effort level: Lite

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