Add search endpoints for projects, sections and labels

[goncalossilva]

Adds support for searching projects, sections, and labels.

API PRs:

• https://github.com/Doist/Todoist/pull/26110
• https://github.com/Doist/Todoist/pull/26113
• https://github.com/Doist/Todoist/pull/26112

[Copilot]

Pull request overview

This pull request adds search functionality for projects, sections, and labels in the Todoist API Python SDK. The changes implement three new search endpoints that allow filtering by name using a query string, complementing the existing list/get operations.

Changes:

• Added three new search methods: search_projects, search_sections, and search_labels
• Introduced endpoint path constants for the new search operations
• Fixed incomplete documentation for the get_labels method's limit parameter

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
todoist_api_python/_core/endpoints.py	Added search path suffix constants for projects, sections, and labels endpoints
todoist_api_python/api.py	Implemented synchronous search methods for projects, sections, and labels; fixed documentation typo in get_labels
todoist_api_python/api_async.py	Implemented asynchronous wrappers for the search methods using the existing async pattern
tests/test_api_projects.py	Added comprehensive test for search_projects covering both sync and async variants
tests/test_api_sections.py	Added tests for search_sections with and without project filtering
tests/test_api_labels.py	Added comprehensive test for search_labels covering both sync and async variants
CHANGELOG.md	Documented the new search functionality in the Unreleased section

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[lefcha]

Everything looks good, only had a couple of minor nitpicks.

[gnapse]

I'll do the same for the TypeScript API wrapper library.

[gnapse]

Done: Doist/todoist-api-typescript#429