Function flattenToScreamingSnakeCase

Example

const obj = {
 ccu: {
 	django: {
 		allowedHosts: '*',
 		csrfCookieSecure: false,
 	},
 },
 sentry: {
 	traceExcludeUrls: ['one', 'two', 'three'],
 	},
 }
 const result = convertToScreamingSnakeCase(obj, { nestedDelimiter: '__' })
 console.log(result)
 // {
 //   CCU__DJANGO__ALLOWED_HOSTS: '*',
 //   CCU__DJANGO__CSRF_COOKIE_SECURE: false,
 //   SENTRY__TRACE_EXCLUDE_URLS: 'one,two,three',
 // }
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