Add Collect communication pattern #301
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Add Collect communication pattern.
The idea is to be able to fetch values from a distributed array to a local array.
In principle this is very similar to HaloExchange, except that the "receive" array is a local separate array.
The setup happens by setting partition and remote index for the values to collect.
HaloExchange pack/unpack routines have been refactored, currently as a copy only used for Collect.
Further the usage for HaloExchange will also use these refactored routines.
💣💥☠️ Static Analyzer Report ☠️💥💣
https://sites.ecmwf.int/docs/atlas/static-analyzer/PR-301