feat(core): Refactor project structure for better modularity and code organization

ts_shared/interfaces/document.ts

@@ -0,0 +1,8 @@
+import * as translation from '../translation.js';
+
+export interface IDocumentSettings {
+  enableTopDraftText?: boolean;
+  enableDefaultHeader?: boolean;
+  enableDefaultFooter?: boolean;
+  languageCode?: translation.TLanguageCode;
+}

ts_shared/interfaces/index.ts

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+export * from './document.js';
+export * from './translation.js';

ts_shared/interfaces/translation.ts

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+export interface IDeDocumentTranslations {
+  address: string;
+  bankConnection: string;
+  contactInfo: string;
+  description: string;
+  invoice: string;
+  itemPos: string;
+  quantity: string;
+  registrationInfo: string;
+  reverseVatNote: string;
+  totalNetPrice: string;
+  unitNetPrice: string;
+  unitType: string;
+  yourCustomerId: string;
+  yourVatId: string;
+  continuesOnPage: string;
+  finalPageStatement: string;
+  page: string;
+}