TreeShake trace in generated code

[ryukzak]

Feature Description
TypeSchema should contain information about changes from Tree Shaker.

Problem Statement
Tree Shaker allows users to skip fields from the types. It should be visible in generated code. It should help with problem location.

Describe the solution you'd like

• Add info to TypeSchema to trace type schema changes.
• Add tree shake report to provide information on package and top level shakinging.
• Provide API from [FileSystem]Writer to generate package and top level readmes, and type level readme.

Add treeshake READMEs for:

• TypeScript
• Python
• SDK
• Mustache