[Idea wanted] Add centralised link list in the network management [long loading time]

[MizukiTemma]

Short description

This is the (probably) easiest and laziest implementation of centralised link list and the classical problem exists here too: the loading time is unacceptably long.

This PR is not intended as final proposal and opened to demonstrate the problem and to ask for ideas/suggestion how to solve it.

• Do you see any possibility to improve loading time with this implementation?
• If we structure the centalised link checker in another way (different from region link list), what do you imagine?

See this cool insctuction for how to test with realistically large data.

Proposed changes

• Reuse the template and view of region link list

Side effects

• Extremely long loading time

Resolved issues

Fixes: #1443

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