Standartize toString() in Druid codebase

[leventov]

class Foo {
  String bar = "baz";
}

1. Version with quotes:

Foo{bar='baz'}

2. Without quotes

Foo{bar=baz}

[jihoonson]

I vote for 2.

[kaijianding]

vote for 1, the IntelliJ IDEA generates toString as option 1

[leventov]

@kaijianding it is configurable.

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[stale]

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