[Feature Request] Allow filtering for access modifier

**Is your feature request related to a problem? Please describe.**
I have `includePrivateMembers` enabled since I need `private methods`. But I need to hide `private fields`.

**Describe the solution you'd like**
Allow filtering in a filter config like this:
```yaml
apiRules:
- exclude:
uidRegex: .*
accessModifier: private
type: Field
```

**Describe alternatives you've considered**
Disabling `includePrivateMembers` is not possible since I need the methods. The only alternative I was able to come up with is creating an attribute and marking every single private field with it.

Another workaround that works in my case is applying the filter like this (but relying on the naming scheme):
```yaml
apiRules:
- exclude:
uidRegex: \._[^\.]*$
type: Field
```