Add related dashboard links in monitoring dashboard

Problem to solve

Grafana has a handy section that contains links to related dashboards based on user preferences; from what I can understand, this could prove useful to whoever is working on triaging an issue that might need to dig deeper into a particular system and or label.

We should allow users customize this either via the YML configuration files or through a specific UI made for this particular purpose

Intended users

Further details

WIP Proposal

MVC

The links will be set up in the .yml file, the user should be able to define different links for any of their dashboards
Similar to the chart links, in the first iteration all links will look the same, and will open in the same tab. The user can right click on the link to open it in a new tab.
Chart links should lead to a full screen chart view.

MVC with one row of links

2nd iteration

When there are more than 1 row of links, there will be an option to collapse/ expand links. We should keep the links panel collapsed by default.
User can set up collections of links that will show up in the UI as dropdowns
User will define the collection name and the links within it in a .yml
The links will retain the time range of the current dashboard.
We should visually differentiate between link types (chart/ dashboard/ external link)
External links will open in a new tab (only charts and dashboards will open in the same tab)