Create elsevier-vancouver-author-date-alphabetical.csl

[POBrien333]

Closes #7393

@adam3smith I just created a new parent style that sorts alphabetically. Let me know if this is the correct approach and then I'll also make the change for the dependent style.

[github-actions]

😃 Your submission passed all our automated tests.

Below are some sample citations generated based on your proposed changes:

elsevier-vancouver-author-date-alphabetical.csl (new)

(Hancké et al., 2007; CSL search by example, 2012)
(Mares, 2001; Fenner et al., 2019)

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CSL search by example. Citation Style Editor 2012. http://editor.citationstyles.org/searchByExample/ (accessed December 15, 2012).
Fenner M, Crosas M, Grethe JS, Kennedy D, Hermjakob H, Rocca-Serra P, et al. A data citation roadmap for scholarly data repositories. Sci Data 2019;6:28. https://doi.org/10.1038/s41597-019-0031-8.
Hancké B, Rhodes M, Thatcher M, editors. Beyond varieties of capitalism: Conflict, contradiction, and complementarities in the European economy. Oxford and New York: Oxford University Press; 2007.
Mares I. Firms and the welfare state: When, why, and how does social policy matter to employers? In: Hall PA, Soskice D, editors. Varieties of capitalism. The institutional foundations of comparative advantage, New York: Oxford University Press; 2001, p. 184–213.

[bwiernik]

I think this is fine

[POBrien333]

Goes with citation-style-language/journals#147 (comment)