Fix has_redisearch await and add py.typed marker

[abrookins]

Fixes #531, #503, and closes #654, #689, #690.

Changes

1. Fix has_redisearch missing await (Coroutine 'has_redisearch' was never awaited #531) - Added missing await when calling has_redis_json() inside has_redisearch(). This was causing "coroutine was never awaited" warnings.

2. Add py.typed marker (Provide types in a mypy compatible format #503) - Added PEP 561 marker file so mypy recognizes the package as typed. Users no longer need to add ignore_missing_imports = true for redis-om.

3. Update migration guide - Added Python 3.10+ and Pydantic v2 requirements to the 0.x to 1.0 migration guide.

4. Add 1.0 release notes - Created comprehensive release notes documenting all breaking changes, new features, and bug fixes.

5. Update spellcheck wordlist - Added technical terms used in documentation.

Issues Closed

• decimal.Decimal breaks JsonModel.find() #654 - Decimal breaks JsonModel.find() - Already fixed in current main
• [Bug 🐞] object has no attribute 'model_fields' #689 - model_fields AttributeError - Pydantic v1 issue, v1 dropped in Redis OM 1.0
• BUG: AttributeError: 'FieldInfo' object has no attribute 'field_info' #690 - FieldInfo.field_info error - Pydantic v1 issue, v1 dropped in Redis OM 1.0