Fix/support for empty header cell

[damonbanks]

Please explain how to summarize this PR for the Changelog:

Tell code reviewer how and what to test:

Upload an excel file with an empty header cell (first, last, , other, , etc) this will convert the null headers to empty, and empty_1 respectively.

[coderabbitai]

Walkthrough

The recent updates to the Flatfile plugin improve the handling of XLSX files by standardizing the processing of null header values and enhancing data extraction efficiency. The code refactor simplifies previous configurations, focusing on streamlined extraction through the new ExcelExtractor and DelimiterExtractor. Additionally, utility functions have been fortified to handle empty and non-unique header values more robustly, thereby bolstering overall data consistency and reliability throughout the processing pipeline.

Changes

Files	Change Summary
.changeset/four-moons-care.md	Enhanced extractor to convert null header values into standardized formats ("empty", "empty_1", etc.), improving data consistency.
flatfilers/sandbox/src/index.ts	Replaced multiple plugins with ExcelExtractor and DelimiterExtractor, simplifying logic to focus solely on data extraction without additional configurations.
plugins/xlsx-extractor/src/header.detection.ts	Added null check in countNonEmptyCells function to exclude explicit null values, enhancing robustness.
plugins/xlsx-extractor/src/parser.ts	Simplified convertSheet function to include all values; updated header handling to improve clarity and maintain consistency in logging.
plugins/xlsx-extractor/src/utils.spec.ts	Introduced unit tests for prependNonUniqueHeaderColumns, validating handling of unique, non-unique, empty, and mixed values.
plugins/xlsx-extractor/src/utils.ts	Modified prependNonUniqueHeaderColumns to replace empty values with 'empty', enhancing reliability in processing records.

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Commits

Files that changed from the base of the PR and between 83ee40f and 4911a9d.

Files selected for processing (1)

• plugins/xlsx-extractor/src/utils.spec.ts (1 hunks)

Files skipped from review due to trivial changes (1)

• plugins/xlsx-extractor/src/utils.spec.ts

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[theycallmeswift]

One minor stylistic comment for the tests, but otherwise LGTM!