New Flowchart Shapes (with new syntax)

[ashishjain0512]

📑 Summary

This pull request introduces several new flowchart shapes along with their test, updates to the configuration files, and improvements to the documentation.

**The most important changes include a guide for other contributors on how to add a new custom shape for flowcharts.

New Tests and Configurations:

• cypress/integration/rendering/flowchart-v2.spec.js: Added a test to render self-loops in flowcharts.
• cypress/integration/rendering/newShapes.spec.ts: Introduced comprehensive tests for new shapes, including various looks, directions, labels, and styles.
• cypress/integration/rendering/oldShapes.spec.ts: Added tests for existing shapes with different looks and directions.

Configuration Updates:

• .cspell/cspell.config.yaml: Added new words to the dictionary definitions.

Documentation Enhancements:

• docs/adding_new_shape/Readme.md: Added detailed documentation on the available utilities for creating new shapes, instructions for adding new shapes, and information on running Cypress tests.

These changes collectively enhance the robustness of the flowchart rendering capabilities and provide clear guidelines for extending the shape library.
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📏 Design Decisions

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