feat: add list method

[CarolinaMoraes]

Summary by cubic

Adds Templates.list() to fetch templates with cursor-based pagination. Introduces shared pagination types and a query builder util to build query params.

• New Features

  • Added Templates.list(options?: PaginationOptions) using getPaginationQueryProperties; returns PaginatedList of templates with before/after/limit support.
  • Introduced PaginatedList, PaginationOptions, and ListTemplatesResponse types.

• Refactors

  • Consolidated tests under Templates block, standardized a TEST_API_KEY, and added unit tests for pagination util and list/get behavior (including query param assertions).

[cubic-dev-ai]

1 issue found across 6 files

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