[http-client] Add client paging typekit

[tadelesh]

Move the paging metadata calculation logic from TCGC to http-client.

[Copilot]

Pull Request Overview

This PR moves the paging metadata calculation logic from TCGC to the http-client package and introduces a new client paging typekit. Key changes include:

• Adding a new getPagingClientMetadata method and helper functions (getContinuationTokenSegments, getNextLinkSegments, etc.) in operation.ts.
• Extending the SdkModelPropertyKit in model-property.ts with a getRootSourceProperty utility.
• Updating getPlausibleName signatures and exporting the new ClientExtensionOptions in index.ts.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/http-client/src/typekit/kits/operation.ts	Adds paging metadata calculation functions and helper functions for client paging operations.
packages/http-client/src/typekit/kits/model-property.ts	Introduces getRootSourceProperty to retrieve the root source for a model property.
packages/http-client/src/typekit/kits/index.ts	Exports a new ClientExtensionOptions interface for client extensions.
packages/compiler/src/typekit/utils/get-plausible-name.ts	Extends getPlausibleName to accept ModelProperty.
packages/compiler/src/typekit/kits/type.ts	Updates getPlausibleName signature to support ModelProperty.

Comments suppressed due to low confidence (1)

packages/http-client/src/typekit/kits/operation.ts:157

• [nitpick] The variable name 'x' is ambiguous. Consider renaming it to a more descriptive identifier, such as 'pagingClientMetadata', to improve clarity.

const x: ClientOperationPagingMetadata = {

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The following packages have changes but are not documented.

• ❌@typespec/compiler
• ❌@typespec/http-client

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