Add service.owner entity

[jpkrohling]

Changes

Implements the service.owner entity as proposed in #3101, adding semantic conventions for service ownership information.

This enables users to annotate services with organizational ownership details, supporting automation for notifications, incident response, and diagnostics.

New Attributes

Attribute	Type	Description
service.owner.name	string	Name of the team or individual responsible for the service
service.owner.url	string	URL to the service's source code repository or documentation
service.owner.contact	string	Contact point or communication channel (e.g., Slack, email)

New Entity

• service.owner - Identifies the team or individual responsible for a service
  • service.owner.name as identifying attribute (required)
  • service.owner.url and service.owner.contact as descriptive attributes

Stability

All new attributes and the entity are introduced at development stability.

Relationship to Existing Conventions

While service.namespace groups services logically, service.owner explicitly conveys organizational ownership and contact details - addressing a common pattern observed in production environments.

Closes #3101

Merge requirement checklist

• CONTRIBUTING.md guidelines followed.
• Change log entry added, according to the guidelines in When to add a changelog entry.
• Links to the prototypes or existing instrumentations (when adding or changing conventions)