feat: implementation for group_degree_centrality, group_closeness_centrality, and group_betweenness_centrality (#1565)

* init

* remove redundant traits

* remove redundant traits

* no dyn

* add tests

* fmt

* dont pass refrence

* fix the tests

* undo changes unrelated to PR

* nox lint

* release note

* Minor fixes: let's not trust that group doesn't have duplicates

* Parallelize group_betweness_centrality

---------

Co-authored-by: Ivan Carvalho <ivancarvalho@gatech.edu>

Author: selmanozleyen

releasenotes/notes/add-group-centrality-5634f19af475fa05.yaml

@@ -0,0 +1,10 @@
+---
+features:
+  - |
+    Added new functions for computing group centrality measures:
+    :func:`.group_degree_centrality`, :func:`.group_closeness_centrality`,
+    and :func:`.group_betweenness_centrality`. These compute the centrality
+    of a group of nodes as defined by Everett & Borgatti (1999). Each function
+    works with both :class:`.PyGraph` and :class:`.PyDiGraph` objects.
+    The corresponding generic Rust implementations are also available in
+    ``rustworkx_core::centrality``.