Add SDMX metadata extractor step in sdmx pipeline

[rohitkumarbhagat]

• add run_from/run_until flags for running range of steps

[gemini-code-assist]

Summary of Changes

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This pull request significantly enhances the SDMX import pipeline by introducing a dedicated step for metadata extraction and providing more flexible control over pipeline execution. The new metadata extraction step streamlines the processing of SDMX metadata by converting it to JSON, which improves efficiency for downstream operations like schema mapping. Additionally, the introduction of run_from and run_until flags allows users to precisely define which parts of the pipeline should run, facilitating debugging, testing, and partial re-runs without affecting other steps.

Highlights

• SDMX Metadata Extraction Step: A new ExtractMetadataStep has been introduced into the SDMX import pipeline. This step is responsible for converting the raw SDMX metadata from XML format into a more easily consumable JSON format, which can then be utilized by subsequent pipeline steps.
• Pipeline Step Range Execution: New command-line flags, --run_from and --run_until, have been added to the SDMX pipeline. These flags allow users to specify a precise range of steps to execute, providing greater control over pipeline runs for debugging, testing, or partial processing.

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[gemini-code-assist]

Code Review

This pull request introduces a new metadata extraction step to the SDMX pipeline and adds run_from/run_until flags for more granular control over pipeline execution. The changes are well-implemented across the pipeline logic, tests, and documentation. I've identified a minor documentation issue and a regression in test coverage that should be addressed.