Lucas/t 231 timebox i can create a company at the same time im creating (#140)

This PR is a bit messy:

adding graphql schema
adding create company creation on company select on People page
some frontend refactoring to be continued

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

front/src/modules/utils/debounce.ts

@@ -0,0 +1,12 @@
+export const debounce = <FuncArgs extends any[]>(
+  func: (...args: FuncArgs) => void,
+  delay: number,
+) => {
+  let timeoutId: ReturnType<typeof setTimeout>;
+  return (...args: FuncArgs) => {
+    clearTimeout(timeoutId);
+    timeoutId = setTimeout(() => {
+      func(...args);
+    }, delay);
+  };
+};

front/src/modules/utils/type-guards/isDefined.ts

@@ -0,0 +1,5 @@
+export function isDefined<T>(
+  value: T | undefined | null,
+): value is NonNullable<T> {
+  return value !== undefined && value !== null;
+}

front/src/modules/utils/type-guards/isNonEmptyArray.ts

@@ -0,0 +1,13 @@
+export function isNonEmptyArray<T>(
+  probableArray: T[] | undefined | null,
+): probableArray is NonNullable<T[]> {
+  if (
+    Array.isArray(probableArray) &&
+    probableArray.length &&
+    probableArray.length > 0
+  ) {
+    return true;
+  }
+
+  return false;
+}

front/src/modules/utils/type-guards/isNonEmptyString.ts

@@ -0,0 +1,15 @@
+import { isDefined } from './isDefined';
+
+export function isNonEmptyString(
+  probableNonEmptyString: string | undefined | null,
+): probableNonEmptyString is string {
+  if (
+    isDefined(probableNonEmptyString) &&
+    typeof probableNonEmptyString === 'string' &&
+    probableNonEmptyString !== ''
+  ) {
+    return true;
+  }
+
+  return false;
+}