Add html output for graph build-order and graph build-order-merge

[czoido]

Changelog: Feature: Add html output for graph build-order and graph build-order-merge
Docs: conan-io/docs#3805

Closes: #16356

[memsharded]

I think it is a pity that we couldnt do this with the other js library, and use the same node formatters. If possible I'd try to use tool-requires and test-requires with a different shape, but not a big issue.
Also the alignment of the layers, but I guess that you have already tried and it is far from easy, so not an issue either.

Good to go!

[czoido]

I think it is a pity that we couldnt do this with the other js library, and use the same node formatters. If possible I'd try to use tool-requires and test-requires with a different shape, but not a big issue. Also the alignment of the layers, but I guess that you have already tried and it is far from easy, so not an issue either.

Good to go!

Yes, it looks like vis.js is not the right library for this kind of diagrams... 🫤
I have updated the output to show the requires from the build context a bit different.

[AbrilRBS]

Few minor comments, otherwise looks good