Query Engine Refactor

[JabobKrauskopf]

Completely remove the old query engine and write a new one from scratch with added funcitonality.

• Define query engine interface #170
• Rewrite Query Engine in Rust #171
• Rewrite rust to python bindings #172
• Rewrite python query engine wrappers #228

---

After the above issues the first draft of the query engine will be merged.

• Fix bugs
  • fix: comparison operations now correctly evaluate operand #233
• Usability improvemets (sorted by importance & difficulty)
  • Replace node.incoming_edges() and node.outgoing_edges() with node.edges(EdgeDirection) #244
  • Add .exclude(query) operand #242
• Write tests #289

---

code example 1

a = edge.attribute("amount").min()
b = a.add(5)

After this, a should represent e.g. 5 and b should then represent 10