Control when a Cell is executing

[MarcosVn]

Problem

• I have an action in my web application to execute a group of <Cell>;

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• If the user performs this action before the code from a previous execution has finished, we get the following error:

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Proposed Solution

• My proposed solution (similar to what we already have for sessions during initialization, for example) would be to have an isExecuting attribute in the CellState for each cell and an isAnyCellExecuting to indicate if there is at least one cell executing.

[MarcosVn]

Hey, @echarles!
I submitted this PR with the proposed solution. I included comments, evidence, and more information there. Thank you!

[MarcosVn]

@echarles, as far as I'm concerned, the issue can be closed once the version with the update is published.

Thank you!