[Single WebEntity] Add a "Related Entities" tab displaying related entities

[boogheta]

This could include child/parent ones, but also citing/cited ones, and allow easily to merge one into the current with a single button as with latest HyBro changes This should provide insights on the distribution of tags, as well as other measures such as indegree

TODO:

• [ ] fix issue with disabling IN entities
• [ ] design the whole tab menus
• [ ] add the list of displayed entities similarily to the page LIST WEs
• [ ] update network on update settings instead of reloading it ?
• [ ] handle filtering cases with no entities to display
• [ ] add filtering and coloring by tag value for each existing category
• [x] handle sigma stacktraces
• [ ] what about darker links in network?
• [ ] Check #368
• [ ] display a webentities list of PROSPECTS related to the entity if it has some crawls (within the Crawls tab or within the related entities one?) (cf #420)
• [ ] button to export the csv list of connected entities (was #318)

WIP in https://github.com/medialab/hyphe/compare/better-ego-network?expand=1