Add basic nodes list & node metadata to OZW config panel

[cgarwood]

Proposed change

• Adds basic nodes list to OZW config panel
• Restructures config panel file layout to better handle additional pages

I'm currently having some issues I haven't been able to figure out with the ozw-network-nodes page and <ha-tabs-subpage-data-table> giving an error that ResizeObserver loop limit exceeded.

I'd also love some tips on centrally managing the navigation tags (basically anything under ozw-network-router should have the same tabs, anything under ozw-node-router should have a separate set of tabs).

I'm also not fully convinced I'm managing the routers correctly... let me know if there's a better way to optimize or handle those.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

[cgarwood]

Added some quick content to the node details page for this first PR. Ready for final review now. I didn't do translations on the Node Management page yet as this isn't its final form

[bramkragten]

What will happen when we request a node that no longer/not exists?

[bramkragten]

So this will not error but return None?

[cgarwood]

Updated to catch a not_found error and show the error page. I used a separate _not_found property to prevent a quick flash of the not found page on initial load before it finishes fetching the node data initially.