feat: add configurable search filters for remote Weaviate datasets

[shubham3121]

This pull request introduces a new, flexible filter schema and logic for the Remote Weaviate dataset type, enabling advanced filtering capabilities in search queries. It also improves configuration schema generation for frontend forms, ensures filter validation, and includes minor code cleanups. The most important changes are grouped below:

Weaviate Remote Filtering Enhancements

• Added a new module filters.py defining filter schemas (FilterCondition, FilterGroup) and logic for constructing Weaviate filter objects, supporting advanced, type-safe, and nested filter conditions. (backend/syft_space/components/dataset_types/weaviate_remote/filters.py)
• Updated RemoteWeaviateConfiguration to accept a filters field, allowing users to specify filters in dataset configuration. (backend/syft_space/components/dataset_types/weaviate_remote/weaviate_type.py)
• Integrated the new filter logic into the search flow: filters are validated, built into Weaviate filter objects, and passed to the query API. (backend/syft_space/components/dataset_types/weaviate_remote/weaviate_type.py) [1] [2] [3] [4]

Configuration Schema Generation Improvements

• Modified ConfigSchemaGenerator to preserve $defs in generated schemas, ensuring $ref pointers remain valid for frontend dynamic form rendering, rather than inlining all references. (backend/syft_space/components/shared/utils.py) [1] [2]

Minor Code Cleanups

• Simplified import statements in marketplaces/handlers.py and chromadb_type.py for clarity and consistency. (backend/syft_space/components/marketplaces/handlers.py [1] backend/syft_space/components/dataset_types/chromadb_local/chromadb_type.py [2]
• Minor formatting and readability improvements in frontend code for update messages and dataset browser logic. (frontend/src/pages/UpdatesPage.vue [1] [2]; frontend/src/composables/useDatasetBrowser.ts [3]