Nufacet resolved input map enhancement

[jrosend]

This pull request includes several changes to the integration/spark module, focusing on enhancing the functionality of the NuFacet class and adding utility methods for configuration handling. The most important changes include updating the .gitignore file, modifying the NuFacet class to include new properties and methods, and adding a new utility class NuFacetsUtils.

Enhancements to NuFacet class:

• integration/spark/shared/src/main/java/io/openlineage/spark/agent/facets/NuFacet.java: Added new properties resolvedInputs and methods getJobNurn and getResolvedInputs to handle job-related information and inputs.

Addition of utility methods:

• integration/spark/shared/src/main/java/io/openlineage/spark/agent/util/NuFacetsUtils.java: Introduced a new utility class NuFacetsUtils with methods parseJsonToMap and getConfigValue for JSON parsing and configuration retrieval.

Update to .gitignore:

• integration/spark/.gitignore: Added integration/spark/docker/notebooks/ to the .gitignore file to exclude the notebooks directory from version control.