Refactor to enforce strictNullChecks

This commit applies `strictNullChecks` to the entire codebase to improve
maintainability and type safety. Key changes include:

- Remove some explicit null-checks where unnecessary.
- Add necessary null-checks.
- Refactor static factory functions for a more functional approach.
- Improve some test names and contexts for better debugging.
- Add unit tests for any additional logic introduced.
- Refactor `createPositionFromRegexFullMatch` to its own function as the
  logic is reused.
- Prefer `find` prefix on functions that may return `undefined` and
  `get` prefix for those that always return a value.

src/infrastructure/Log/ConsoleLogger.ts

@@ -1,13 +1,17 @@
 import { ILogger } from './ILogger';
 
 export class ConsoleLogger implements ILogger {
-  constructor(private readonly globalConsole: Partial<Console> = console) {
-    if (!globalConsole) {
+  constructor(private readonly consoleProxy: Partial<Console> = console) {
+    if (!consoleProxy) { // do not trust strictNullChecks for global objects
       throw new Error('missing console');
     }
   }
 
   public info(...params: unknown[]): void {
-    this.globalConsole.info(...params);
+    const logFunction = this.consoleProxy?.info;
+    if (!logFunction) {
+      throw new Error('missing "info" function');
+    }
+    logFunction.call(this.consoleProxy, ...params);
   }
 }