Security Fix: Updating graph parser for potential injection cases

[Threated]

Pull Request check-list

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• Does $ tox pass with this change (including linting)?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?
• Was the change added to CHANGES file?

Description of change

Added string escape to properly escape \ in helper method quote_string
Added tests

cc @chayim

[codecov-commenter]

Codecov Report

Base: 92.23% // Head: 92.23% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (aa69334) compared to base (f46d7f3).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@ Coverage Diff @@ ## master #2548 +/- ## ======================================= Coverage 92.23% 92.23% ======================================= Files 115 115 Lines 29554 29561 +7 ======================================= + Hits 27260 27267 +7  Misses 2294 2294 

Impacted Files	Coverage Δ
redis/commands/helpers.py	87.50% <100.00%> (+0.13%)	⬆️
tests/test_graph.py	91.56% <100.00%> (ø)
tests/test_helpers.py	100.00% <100.00%> (ø)
tests/test_cluster.py	96.90% <0.00%> (-0.12%)	⬇️
tests/test_asyncio/test_cluster.py	97.60% <0.00%> (+0.12%)	⬆️

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