Add C# parser for the DOT output

[mrseanryan]

parsers/csharp-dot-parser

DOT AST Library: https://abock.github.io/dotlang/

.

[mrseanryan]

Algorithm:

1. client implements an interface IDotModelVisitor (give a default implementation that just dumps to console)
2. gpt-workflow-csharp: parse the DOT into an AST
3. for all nodes in the AST, call visitor.VisitNode(node)
4. for all edges in the AST, call visitor.VisitEdge(edge)

This way, the client can generate another output OR populate some other system to match the DOT graph.

node has a NodeType that matches the prompts whitelist:

• start, decision, end, while_, read_items_fromstorage, write_items_tostorage, create_listenumerator, has_list_enumerator_moreitems, get_next_item_fromenumerator, variable, parameter, callflow, other_
• node has: Identifier (string)

[mrseanryan]

does look like Visitor pattern

IDotModelVisitor

VisitNode VisitEdge

[mrseanryan]

done