fix: added attribute merging to logCheckoutOptionEvent#65

khushi1033 merged 1 commit intodevelopmentmparticle-integrations/mparticle-javascript-integration-google-analytics-4:developmentfrom

fix/SDKE-781-added-attribute-merging-to-logCheckoutOptionEventmparticle-integrations/mparticle-javascript-integration-google-analytics-4:fix/SDKE-781-added-attribute-merging-to-logCheckoutOptionEventCopy head branch name to clipboard