Add Spector tests for pageable LROs

[Copilot]

Plan for Pageable LRO Spector Tests

• Create new directory structure at /azure/core/lro/pageable
• Create main.tsp with pageable LRO operation using GET method
• Create mockapi.ts with mock API implementation
• Validate the TypeSpec files with build command
• Test the mock APIs with validation command
• Apply code formatting
• Add Python namespace
• Add changelog under .chronus/changes

Original prompt

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This section details on the original issue you should resolve

<issue_title>Need Spector tests for pageable LROs</issue_title>
<issue_description>### Clear and concise description of the problem

It should be in its own group, not added to existing lro/pageable test suites.

Checklist

• Follow our Code of Conduct
• Check that this issue is about the Azure libraries for typespec. For feature request in the typespec language or core libraries file it in the TypeSpec repo
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.</issue_description>

Comments on the Issue (you are @copilot in this section)

@msyyc Context: You could refer to existing LRO spector case https://github.com/Azure/typespec-azure/blob/main/packages/azure-http-specs/specs/azure/core/lro/standard/main.tsp and paging case https://github.com/Azure/typespec-azure/blob/main/packages/azure-http-specs/specs/azure/payload/pageable/main.tsp. Combine lro and paging to get lro-paging api

ASK:
(1) the http method shall be GET
(2) the interactive process is at first for lro then for paging</comment_new>

• Fixes Need Spector tests for pageable LROs #3655

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commit: 6a5bdde