[feature] Add netjsongraph static files for reusable inclusion

[nemesifier]

Let's centralize the netjsongraph.js dependencies so we can include them in different modules without duplicating the static files and make loading more efficient.

Depends on: openwisp/openwisp-monitoring#709

[Piyushrathoree]

@pandafy hey hi can I work on this ?

[Ajay110125yadav]

I am working on this issue .

[ukramkrishna4-jpg]

Hello,

I am interested in working on this issue and contributing to OpenWISP.

Is this issue still actively being worked on? If not, I would be happy to help implement this feature.

Thank you!

[aswinms926]

@nemesifier Hi! I see that someone has started working on this issue.
If help is needed or if the issue becomes available again, I would be happy to contribute.

[openwisp-companion]

Hi @kunalverma2512 👋,

Thank you for opening PR #675 to address this issue!

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