Added load partioning for distributed runtime.

[aristotelis96]

Abstracted duplicate code for different distributed runtime communication frameworks.
Added distributed/coordinator/scheduling/LoadPartitioningDistributed.h class which is used to:

• Split ranges based on some policy. For now only broadcast and simple distribution is supported.
• Sets the metadata of the matrix being distributed/broadcasted.
• Contains a static method which sets the metadata of the outputs during the computation step.
• This class can be extended in order to support more complex distribution strategies.

[corepointer]

Thanks for your contribution @aristotelis96 ! In the future, please add a reference to the issue/PR number to the first line of the commit message (e.g., "[DAPHNE-#489] Added load partitioning for distributed runtime"). That helps to reference any discussion that might relate to the change. Furthermore, if you merge/push from your local copy, then adding "Closes #489" in the last line of the commit message automatically changes the status of the open issue/PR to closed or merged.
Best regards, Mark

[aristotelis96]

Thanks for the tip @corepointer! I will make sure to include PR/issue number in future merges.