A_STAR algorithem Implementation #582
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References to other Issues or PRs or Relevant literature
Fixes #486
Brief description of what is fixed or changed
Added A* pathfinding algorithm implementation (_a_star_adjacency_list). This Algorithm uses the Manhattan distance heuristic for coordinate-based nodes and Returns shortest path distance and predecessor dictionary like other pathfinding algorithms
Other comments
used the below to pull requests
https://github.com/codezonediitj/pydatastructs/pull/283/files
https://github.com/codezonediitj/pydatastructs/pull/301/files