feat(gateway): add new debugger span attributes

[akashtjohn]

Description

Added the following debugger span attributes

• roxy.kong.upstream.address
• tls.client.server_name

kong-ee PR: https://github.com/Kong/kong-ee/pull/20007

Preview Links

Checklist

• Tested how-to docs. If not, note why here.
• All pages contain metadata.
• Any new docs link to existing docs.
• All autogenerated instructions render correctly (API, decK, Konnect, Kong Manager).
• Style guide (capitalized gateway entities, placeholder URLs) implemented correctly.
• Every page has a description entry in frontmatter.
• Add new pages to the product documentation index (if applicable).

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