Refactor DI container for better structure and clarity

- Moved `TSinjex` class to `classes` directory for better organization.
- Updated imports across the codebase to reflect the new location of `TSinjex`.
- Introduced `Identifier` type to standardize dependency identifiers.
- Enhanced JSDoc comments for improved clarity and consistency.
- Adjusted error messages for `DependencyResolutionError` to provide clearer information.
- Updated and expanded decorator and function types to use `Identifier` type.

src/interfaces/Exceptions.ts

@@ -10,7 +10,7 @@ export class TSinjexError extends Error {
      */
     constructor(message: string) {
         super(message);
-        this.name = 'TSInjex';
+        this.name = 'TSinjex';
     }
 }
 
@@ -24,7 +24,7 @@ export class DependencyResolutionError extends TSinjexError {
      * @param identifier **The identifier of the dependency**
      */
     constructor(identifier: string) {
-        super(`Dependency ${identifier} not found.`);
-        this.name = 'TSInjexResolutionError';
+        super(`Dependency ${identifier} could not be resolved.`);
+        this.name = 'TSinjexResolutionError';
     }
 }