Remove lodash.isequal in favor of built-in array method

[amccarthy1]

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Summary

I recently installed fast-xml as a replacement for csv-stringify, and while I was happy to see a bundle size reduction, I noticed that around half of the bundle size from its usage was coming from lodash.isequal.

I noticed that this package is only used for one call that can be easily replaced with a native call to Array.every. The result should shave around 10KB (roughly half the total size) off bundle sizes in the browser.

Test coverage

This case seems to be covering the case where headers=true is passed, but the headers are inferred from the first row, which is an array of strings, to prevent double-writing the headers. I verified that, when I changed this to return true, 33 tests failed, implying significant coverage of this case.

I also verified that there is a specific test covering exactly this behavior, at RowFormatter.ts:119-124 (pasted here for clarity)

                describe('with headers=true', () => {
                    it('should only write the first row', async () => {
                        const formatter = createFormatter({ headers: true });
                        await expect(formatRow(headerRow, formatter)).resolves.toEqual([headerRow.join(',')]);
                    });
                });

[juanri0s]

@amccarthy1 thanks for contributing! Mind rebasing and resolving conflicts please?