Use LazyBroadcast for subsidence tendency #3579
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A step towards #3594.
This PR adds the use of LazyBroadcast for the subsidence tendency.
This will actually have a performance regression because caching will likely payout here (the norm over components in the local geometry is probably a lot of reads, inside the upwind/div, *3x per equation). Once we have a lazy IntervalMesh / coordinates, the performance should be unchanged or better.
I'll leave this as a draft for now.