Making some Types and Properties public to allow building of custom tools with it

[CortiWins]

Purpose of this PR

The changes make three types public

• PositionToolContext
• TextureToolContext
• CutTool

This allows to build shortcuts that probuilder into the respective tools and edit mode.

The changes one property public

• MeshSelection.totalVertexCountOptimized

it is calculated and updated in the same way all other public statistics are, so making it public allows to build UI that shows statistics.

[unity-cla-assistant]

All committers have signed the CLA.

[u-pr-agent]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪ The PR is very small and only changes access modifiers to make certain classes and properties public, with no logic changes.

🏅 Score: 100 The PR correctly implements its stated goal of exposing specific types and properties, follows good practices by updating the changelog, and introduces no new logic or complexity.

🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

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[u-pr-agent]

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