Explore and document nullable field behavior for READ DTOs

[Ckk3]

Description

This PR is intended to support the discussion around how strawchemy should determine GraphQL nullability for READ DTOs.

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Documentation

Issues Fixed or Closed by This PR

• Fixes Source of Truth for Nullable Fields in READ DTOs #151

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

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