OnLogWarningMessage

[EdwardChaplinArchilizer]

###Purpose
Add guide for generating custom warning messages in Dynamo nodes

This update introduces a comprehensive guide to implementing OnLogWarningMessage in Zero Touch nodes. The guide covers the importance of logging warnings, common use cases, and practical examples to help developers enhance their custom nodes.

Key additions:

• Step-by-step instructions for integrating OnLogWarningMessage.
• Example for validating numeric inputs in a grid creation node.
• Example for handling null or empty collections in a polygon creation node.
• Example for verifying file type compatibility in a file processing node.

This also adds a new page into the primer under Developing for Dynamo. This new page is called "Advanced Dynamo Node Customisation" and will sit here in the table of contents:

###Declarations
Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

###Release Notes
Add guide for generating custom warning messages in Dynamo nodes

Reviewers
@dnenov
@achintyabhat
@QilongTang

Informed
@Amoursol