Counter mode deprecation

[jlstevens]

This PR is work-in-progress and aims to remove the DynamicMap counter mode now that streams offer a much more principled way of achieving the same thing.

TODO:

• Update the DynamicMap tutorial.
• Test this works properly with other notebooks using DynamicMap.
• Make sure we are clear about get_dynamic_item and associated semantics.
• We probably no longer need both mode and call_mode.
• Before the assumption was that is call_mode='key' then the mode was 'bounded'. With streams, this is not quite right: bounded should apply if any of the kdims are bounded.

[jlstevens]

Unit tests need updating and the DynamicMap tutorial also needs to be updated. I've checked the DynamicMap tutorial works up to the point where counter mode is introduced. Seems like we'll have to update the notebook test data for this one...

[philippjfr]

Going to close this as it has been superseded by #1238.

[jlstevens]

I think this point is still valid:

• Make sure we are clear about get_dynamic_item and associated semantics.

[philippjfr]

Sure, we can discuss that in #1240, which reimplements get_dynamic_item.

[github-actions]

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