Expose custom components to devtools

[KaelWD]

What problem does this feature solve?

Currently there is a check for node.name === 'RouterLink' when showing route tags on nodes in devtools, so custom components using the useLink composable instead don't display these.

What does the proposed API look like?

• Remove the check on line 90 of devtools.ts (replace with something else?)
• Move the devtools section from RouterLink:175 into useLink