APP-9107 : Add sdk support for rich text enrichment

[vaibhavatlan]

✨ Description

Briefly explain the purpose of this PR and what it covers. Mention any related issues or Jira tickets.

Jira link: [Insert link here]

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🧩 Type of change

Select all that apply:

• 🚀 New feature (non-breaking change that adds functionality)
• 🐛 Bug fix (non-breaking change that fixes an issue) — please include tests! Refer testing-toolkit 🧪
• 🔄 Refactor (code change that neither fixes a bug nor adds a feature)
• 🧹 Maintenance (chores, cleanup, minor improvements)
• 💥 Breaking change (fix or feature that may break existing functionality)
• 📦 Dependency upgrade/downgrade
• 📚 Documentation updates

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✅ How has this been tested? (e.g. screenshots, logs, workflow links)

Describe how the change was tested. Include:

• Steps to reproduce
• Any relevant screenshots, logs, or links to successful workflow runs
• Details on environment/setup if applicable

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📋 Checklist

• My code follows the project’s style guidelines
• I’ve performed a self-review of my code
• I’ve added comments in tricky or complex areas
• I’ve updated the documentation as needed
• There are no new warnings from my changes
• I’ve added tests to cover my changes
• All new and existing tests pass locally

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Note

Introduces RICH_TEXT custom attribute type, marks options as rich-text (non-multi-valued), and adds an error for invalid rich-text creation.

• Custom Metadata / Typedefs:
  • Add RICH_TEXT to AtlanCustomAttributePrimitiveType in pyatlan/model/enums.py.
  • Extend AttributeDef.Options to support is_rich_text and set it when type is RICH_TEXT; force options.multi_value_select=False for rich text in pyatlan/model/typedef.py.
• Validation:
  • In AttributeDef.create and AttributeDef.create_async, reject multi_valued=True when attribute_type == RICH_TEXT by raising an SDK error.
• Errors:
  • Add ErrorCode.INVALID_RICH_TEXT_CREATION (400-076) in pyatlan/errors.py for attempting to create multi-valued rich-text attributes.

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