feat(coretime): add Overview page

[bee344]

Description

Adds the Overview page to the Coretime tab. This first step aims to add a Coretime tab to integrate its functionalities with PJS/APPS, with an Overview page that provides some relevant Summary information in a user-friendly manner.

Tasks for Coretime Chain

• Add Summary.
• Add Workload.
• Add Workplan as a separate table.
• Update Workload to improve readability.
• Add filters to Workplan and Workload to filter by core and timeslice.
• Modify appearance.

Tasks for Relay Chain

• Add Summary including Spot Traffic, core usage.
• Add Core Descriptors as table.
• Add Core Schedules as table

Optional:

• Modify appearance adding a timeline.

Regarding the appearance, I'm thinking on something simmilar to the Referenda page, since the amount of information for Workload and Workplan is substantial.
E.G. Image:

This is only as to reference the functionality of collapsing a table and adding a filter.

Part 1 of #10285

[bee344]

A small sidenote: onDemandCoretimeAssigner wasn't included in the Overview since it isn't in use currently, and although we could make assumptions on how it would look liker, as evidenced with the key for coreDescriptors, sometimes stuff doesn't show up as it should. So I think it's better to wait until we have something to work with and then including it.

[TarikGul]

After some discussion we decided to switch the logic into 2 pages.

pages-broker
pages-coretime