Add option to resolve type when dumping heap summary.

[r12f]

Description

This change adds --resolve option to resolve the type and categorize the chunks, using vtable in the chunk.

Since multiple types of objects could share the same size, also it is impossible for anyone to remember the size of all the objects in the system, categorize and output the chunks by object type will become very handy when debugging issues like memory leaks.

Here is a screenshot to show how the change works:

In this test process, we can see we created 23423 Task objects, which pops up and might indicate a leak.

• My code follows the code style of this project.
• My change includes a change to the documentation, if required.
• If my change adds new code, adequate tests have been added.
• I have read and agree to the CONTRIBUTING document.

[r12f]

This change will have some merge conflicts with #1029 . Once #1029 is checked in, I will merge the changes and update the PR. But the current change should have the high level idea captured. Let's see if this idea makes sense or not.

[hugsy]

Yet another awesome PR, LGTM

[Grazfather]

Seems there's no conflict.