[VC-1161] update tn-alloc Schema

[Arsh-Sandhu]

No description provided.

[Copilot]

Pull request overview

Updates the Telephone Number Allocation credential definition to a new schema version, aligning it with newer JSON Schema drafts and expanding documentation/examples to reflect updated number and rules modeling.

Changes:

• Revamps tn-alloc.schema.json to v2.0.0 (JSON Schema 2020-12), refines field constraints, and changes numbers to an array of number expressions.
• Expands tn-alloc/index.md documentation to describe number expressions, channel handling, edges, and governance/rules semantics.
• Updates the example credential and the global registry.json entry to reference the new schema SAID.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 16 comments.

File	Description
tn-alloc/tn-alloc.schema.json	Schema v2 update: new draft, stricter patterns/examples, updated numbers modeling, updated rules/edges structure.
tn-alloc/index.md	New/expanded spec documentation for the v2 schema semantics.
tn-alloc/example-tn-alloc.json	Example updated to match the new schema SAID and the new numbers / channel shapes.
registry.json	Updates registry mapping to the new tn-alloc schema SAID.

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