feat: add resizable table columns

[johncowen]

Whilst the feature here is making our table columns resizable, kongponents provides us with this functionality. But kongponents rightly doesn't dictate how you should persist the column sizes once resized.

Therefore the majority of this PR is providing a way application-wide that we can persist and retrieve user preference/settings/values etc. Here we use localStorage but we could just as well switch in a separate set of sources to use something different such as a users session.

I chose to key settings by route name, and after doing so I figured we may as well make all this available via RouteView.

Notes:

• Adds DataSink, a writing version of DataSource. The most important thing for me here is the interface. The innards of DataSink and how it works under-the-hood will no doubt change, but I don't want to do all that at this stage, only enough for me to add this feature.
• Moves DataSource:src="/me" into RouteView and then provides RouteView#me via RouteViews slot. I figure every route will potentially need to get/set user persisted values so we may as well make it available via the RouteView rather than have to repeatedly add the DataSource everytime as we do previoius to this PR.
• I've only done MeshListView for now for proof-of-concept, if I get an initial approval of this, next steps will be to roll this out everywhere.

Part of #2468

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