Add java.util.Objects.dump to facilitate quick debugging

[Yi Yang]

Is it helpful to add a new Objects.dump method for quick debugging? Not in all cases
we can open IDEA and happily use jdb to debug our code, sometimes we may just want
to write a simple script, or work without IDE, for these cases, we can use Objects. dump
to output field details of the object and feed back to the developer, so that they can quickly
modify the code and continue to develop. Another useful scenario is working within jshell,
Objects.dump can visualize object details, which is especially useful for REPL environments.

It looks like var_dump() in PHP[1] :
```
Person p = new Person(...)
Objects.dump(p)
Person = {
  name = "..."
  age = 24
  height = 1.75f
  attr = {
     ...
  }
}
```
In addition, we can also add Config parameters to allow users to control output content and
format they expect, such as
```
config.pretty = true
config.maxDepth = 5
config.dumpParent = true
config.fieldFilter (Field f) -> ...
Objects.dump(obj, config)
```
This is just a very rough idea, it's too early to discuss implementation details at this point,
I'm looking forward to hearing more feedback about the idea of adding Objects.dump itself.

Thanks.

[1] https://www.php.net/manual/en/function.var-dump.php