Make HOCON config ToString() method more readable

[Horusiath]

Right now HoconConfig ToString method produces string containing only key-vals of the current config. Since structure of config objects often heavily relies of fallback mechanism, in order to get all current (overriden) key-vals in current config section is very exhausting.

Therefore we could change current ToString behavior (or expose its version in form of ToString(string format)) that could return all of the current key-values for the hocon config. Example, given two hocon configs A and B with set in fallback relation:

# A
some.path {
  key11 = "value11"
  key12 = "value12"
}

# B
some.path {
  key11 = "value21"
  key22 = "value22"
}

using configA.WithFallback(configB).ToString(indentation: true) would print current key-values of A, followed by key-values being fallback from B:

some.path {
  key11 = "value11" 
  key12 = "value12"
  key22 = "value22"
}

[mukulsinghsaini]

Hi Horusiath,
I have implemented this method. It gives the current key-values merged with key-values from fallback.
It can work on multiple fallback chains likeconfigA.WithFallback(configB).WithFallback(configC)...

I have used the method signature
public string ToString(Boolean includeFallback)

I want to confirm if its ok to use this method signature or I need to improve it before I send a pull request.Thanks.

[Horusiath]

@mukulsinghsaini I think it's a good idea :) Could you create a PR and link this issue with it?

[marcpiechura]

Closed via #1800