Improve resource subscription performance and safety

[JamesNK]

Addresses #2496

The goal of these changes is to make the dashboard client update the UI at the interval it wants to (max 10 times a second) and not the interval that external data sources force upon it.

• Change resource update stream to always return a list of updates. This allows multiple changes to be applied to the UI before re-rendering. I made the underlying stream return a list rather than just rely on GetBatchesAsync because the first write to the channel will trigger to reader. There is no write then flush.
• Add minReadInterval to GetBatchesAsync. This puts a limit on how often data is returned. If the UI is updating frequently this will cause fewer, bigger updates. Prevent UI re-rendering too much.
• Change DashboardClient.SubscribeConsoleLogs to read from gRPC and write to a channel, then read from the channel in batches. Allows it to take advantage of improvement to GetBatchesAsync.

Telemetry subscriptions will be in a separate PR. Telemetry subscriptions are different in that they use callbacks instead of async streams. The idea will be the same, limit callbacks to a min interval, but the implementation will be different.