feat: add delegation frontend

[hamza221]

STATUS: I'll wait for the backend to get merged before continuing with this

requires #12605
ref #12403

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• Design review
• hide action on delegated accounts

[nimishavijay]

Awesome! Looks really nice! Only some small changes. Overall:

• The icon for delegation (across the board) can be supervisor account. The one you've chosen is also very similar but we use that for indicating users and groups
• Instead of "Delegation", I'm wondering if we can use the wording "Delegate account" in the 3 dot menu and the modal title
• Use tertiary buttons for all the "Cancel" buttons and don't use the icon.

In the "Delegation" modal:

• There is some whitespace on top which shouldn't be there (somewhow not there in the "Add delegates" modal)
• We can also center align the "Delegates" heading. Ik in @kra-mo's mockups it was left aligned, but because in the component we always have the heading in the center it looks inconsistent now.
• I see that there's a h3 { font-weight: bold; } which makes the "Delegates" heading stronger than its parent heading. We could remove that

In the "Add delegates" modal:

• the select component should be full width

[kra-mo]

We can also center align the "Delegates" heading.

I was going off of form group components, not a dialog, in this context, I think the two different headings don't make sense either, we could just have one "Delegates" title :)

[kra-mo]

Adding to what @nimishavijay said, the "Revoke" button should also probably not have an icon, a checkmark with danger styling is always confusing :)

Additionally, the user selection dropdown should be full-width and there should be a bit more padding between the explanation text beneath and the buttons, also in the revoke access dialog.