[utilities]: add basic ts guards like `isString`, `isNumber`, ...

Adds typescript guards for some basic type checks like:
- `isString`
- `isNumber`
- `isBoolean`
- `isDefined`
- ...

This helps for readable code like:

```
if(isDefined(weight) && isDefined(height)){
  const total = weight * height
}
```

or

```
informations
  .filter(isDefined)
  .map(i => i['note'])
```