RFR: 7031: Build a constant pool explorer page

[Marcus Hirt]

On Thu, 11 Mar 2021 21:16:35 GMT, Jean-Philippe Bempel <github.com+4610701+jpbempel at openjdk.org> wrote:

> Add under Recording a new Page for ConstantPools
> Help to visualize what's inside constant pools part of a JFR recording
> 
> ![JMC_ConstantPoolsPage](https://user-images.githubusercontent.com/4610701/110855759-13569700-82b7-11eb-9981-deb0b8b5e185.png)
> 
> *Draft*
> - Icon is copy/paste from recording. If you have idea about how to replace it...
> - I have limited the tables to the search toolbar, visible by default
> - a hidden count column for constant values helps you find out when you duplicates constant (for OldObjectSample event issue) should not be useful otherwise

Marked as reviewed by hirt (Lead).

-------------

PR: https://git.openjdk.java.net/jmc/pull/228