Add readOnly annotations to JSON schema and filter in PyDABs

[shreyas-goenka]

Summary

This PR adds readOnly and doNotSuggest annotations to the JSON schema for fields that are computed at runtime and should not be set by users.

Builds on: #4414

Changes

JSON Schema

• Add ReadOnly field to the Schema struct (standard JSON schema annotation)
• Fields with bundle:"readonly" tag are now marked with readOnly: true and doNotSuggest: true
• Fields marked as OUTPUT_ONLY in OpenAPI spec get readOnly: true and doNotSuggest: true

PyDABs Code Generation

• Add read_only field to the Property dataclass to parse readOnly from schema
• Add remove_readonly_fields() function to filter out readonly fields from code generation
• Readonly fields like create_time, id, lifecycle_state are now excluded from generated Python code

Test plan

• Unit tests pass for jsonschema package
• Unit tests pass for schema generation
• Python codegen tests pass
• Schema correctly includes readOnly and doNotSuggest for output-only fields

🤖 Generated with Claude Code