Add fluid flow wan simulation model#257
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This reverts commit 9cd0c04 as the changes for it are in the digital-twin-sbir-develop-flow-control branch.
Add flowlet and switch-training logs, queued-before/drop fields, configurable switch schedulers, two-phase egress allocation, and fragment coalescing for cleaner rollback and ML training targets. Rename receive counters to received_fragments.
Buffer CSV rows in memory for both sequential and optimistic runs, then merge logs after simulation completion to avoid event-path file I/O and unsafe parallel appends. Refactor common terminal and switch logging paths, add CSV file-open checks, and keep optimistic logging rollback-safe through commit handlers. Use MPI_COMM_CODES consistently, remove dead event/config fields, document the large reverse-allocation event payload, clean up comments, and release switch queue storage during finalization.
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This PR adds a PDES simulation model for network traffic modeled as fluid flows at fixed intervals through a Wide Area Network.