Make DependeyGraph use IdentifierHash as GraphIndex

[MaciejKaszynski]

What

Current in the DependencyGraph we use a std::vector and return the index of the graph, the user then has to track that.

This means we are also need to keep track in a separate place. So just using a map is probably the better option.

TODO:

• GraphIndex type: Change from std::size_t to IdentifierHash
• dep graph:
  • Change std::vector<GraphNode> nodes to std::unordered_map<IdentifierHash, GraphNode> nodes
  • should we just track capacity_ or remove?
  • Change visited (not sure what is best there).
• RunTarget and ProcessInfoNode take an index, this shall be removed and the map shall track this now.
• traverse() Not sure what is the best there, keep the map iterator

Acceptance Criteria (DoD)

• DependencyGraph uses IdentifierHash as the key

How

No response