feature/ Catalog implementation - Updated folder structure and added Catalog to activity bar

[aditee-accenture]

Catalog Implementation: This feature is to expand the Dataset Explorer panel's scope from displaying only native BigQuery assets to include both BigQuery and BigLake assets.

Changes included in the CL:

1. Renamed the Dataset Explorer to Catalog in Primary Activity bar.
2. To align with the broader scope, the internal directory structure has been refactored to reflect the new Catalog architecture. The src/bigQuery directory was migrated into a new src/catalog folder, separating the main widget into src/catalog/bigquery/ and reusable components into src/catalog/common/.

[gemini-code-assist]

Summary of Changes

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This pull request rebrands the "Dataset Explorer" functionality as "Catalog" to better represent its expanded capabilities. The change allows the panel to display a broader range of data assets, including BigQuery and BigLake, enhancing its utility as a central data discovery tool.

Highlights

• Renaming: The "Dataset Explorer" component has been renamed to "Catalog" across the application's UI and internal code.
• Scope Expansion: This renaming reflects an expanded scope for the panel, which now supports displaying both BigQuery and BigLake assets, moving beyond native BigQuery assets only.

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Changelog

• src/bigQuery/bigQueryWidget.tsx
  • Updated the displayed title string from "Dataset Explorer" to "Catalog".
• src/index.ts
  • Renamed the panelDatasetExplorer variable to panelCatalog.
  • Adjusted theme change logic to reference panelCatalog.
  • Modified panel initialization to use panelCatalog and set its caption to "Catalog".
  • Updated logging messages to reflect "Catalog is enabled".
  • Refactored the instantiation of NotebookButtonExtension for cleaner formatting.
• ui-tests/tests/bigquery_dataset_explorer.spec.ts
  • Updated UI test selectors to target the new "Catalog" tab name.

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[gemini-code-assist]

Code Review

This pull request renames the 'Dataset Explorer' to 'Catalog' for the BigQuery panel, which is a clear improvement given the expanded scope. The changes are mostly straightforward string and variable replacements. I've suggested a few minor changes to improve consistency in variable and test naming. Also, consider renaming the test file ui-tests/tests/bigquery_dataset_explorer.spec.ts to something like ui-tests/tests/catalog.spec.ts to reflect the feature's new name.