Add method types to SDK methods

[albertokarakoutev-smar]

Pull Request

Description

• Add generics to all composite types, e.g. IndexResult
• Add typing to all SDK method signatures
• Update existing docstrings to reflect typing

Type of Change

• Bug fix
• New feature
• Documentation update
• Code refactoring
• Other (please describe):

Environment Information

• Smartsheet API Version: 2.0
• Smartsheet Python SDK Version: 3.5.7
• Python Version: 3.13

Why These Changes Were Made

To improve usage of the API

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have updated the relevant files in docs-source/ (see Documentation guidelines)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[roomote]

Rooviewer   See task on Roo Cloud

Re-review completed. No new issues found.

The latest commit is a merge from mainline that updates CHANGELOG with version 3.6.0 release information. No concerns.

Previous reviews

• 91a54a2: Review #1
• 94a8d62: Review #2
• e6124fb: Review #3

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}