ICEServerInfo の urls の型を [URL] から [String] に変更

[zztkm]

変更内容

• [FIX] URL 構造体が TURN URI に対応していないのに、URL に変換していたのを修正する
  • 意図しないエスケープが発生しないようにした

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This pull request includes changes to the Sora/ICEServerInfo.swift file to handle TURN URIs as strings instead of URLs, and a related fix in the CHANGES.md file. The most important changes are summarized below:

Handling TURN URIs as Strings

• Sora/ICEServerInfo.swift: Changed the urls property from [URL] to [String] to handle TURN URIs as raw strings.
• Sora/ICEServerInfo.swift: Updated the RTCIceServer initialization to use the urls array directly without converting to absoluteString.
• Sora/ICEServerInfo.swift: Modified the initializer to accept urls as [String] instead of [URL].
• Sora/ICEServerInfo.swift: Adjusted the Codable conformance to decode urls as [String] and added debug logging for each URL.

Documentation Update

• CHANGES.md: Added a fix entry for handling TURN URIs correctly to prevent unintended escaping.