Add DOT import

[mattkjames7]

Description

Added ability to import DOT files or a string containing DOT code, e.g.:

import gqlalchemy

importer = GraphImporter(graph_type="NX")
importer.translate_dot_file("ninja-build-graph.dot")

Pull request type

Please delete options that are not relevant.

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring with functional or API changes
• Refactoring without functional or API changes
• Build or packaging related changes
• Documentation content changes
• Other (please describe):

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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Reviewer checklist (the reviewer checks this part)

• Core feature implementation
• Tests
• Code documentation
• Documentation on gqlalchemy/docs

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Note

Medium Risk
Adds a new DOT parsing/import path (via optional pydot) with non-trivial attribute normalization and ID generation, plus CI dependency-install changes that could affect test coverage/compatibility.

Overview
Adds DOT graph import support to GraphImporter (NetworkX mode) via new translate_dot_file()/translate_dot_data() APIs backed by optional pydot, converting DOT graphs into NetworkX and enriching nodes/edges with stable IDs, sequences, sanitized/flattened attributes_* properties, and attributes_json.

Introduces a new dot extra (and includes it in all) in pyproject.toml, updates CI workflows to install explicit extras (including dot) instead of --all-extras, adjusts the TF-GNN install task to also install tf-keras, and adds docs + tests covering DOT import and normalization edge cases (key collisions, multiedges, file/data parsing).

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[mattkjames7]

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