test: add tests for `toJSON` method in `dstructs/named-typed-tuple`#8049

kgryte merged 2 commits intostdlib-js:developstdlib-js/stdlib:developfrom

Gauravkaushik-1206:create-to-json-test-fileGauravkaushik-1206/stdlib:create-to-json-test-fileCopy head branch name to clipboard