Store executions in analytics engine and r2

[bchapuis]

Store datapoints for each executions in analytics engine. These datapoints will be displayed on the execution page (there is a retention limit of three months which is ok). Check if it is possible to decare index (e.g. on the org id). There is no need to store the data here and there is a limit of 16KB per records.

In parallel, store the complete json of the execution in r2 for inspecting the exectuion (inputs, outputs, workflwo, data, etc.)