added dashed hatch pattern

[ShivamPathak99]

PR summary

Added a Dashed hatch pattern in hatch.py.
Fixing #27337

PR checklist

• "closes Update hatch.py #27337 " is in the body of the PR description to link the related issue
• new and changed code is tested
• Plotting related features are demonstrated in an example
• New Features and API Changes are noted with a directive and release note
• Documentation complies with general and docstring guidelines

[rcomer]

Thanks for picking this up @ShivamPathak99! I think this will need

• an image comparison test to verify that we get the expected result
• an entry in the What's New
• add the new style to the Hatch Style Reference
• track down anywhere in the documentation where the list of built in hatches are spelled out like Collection.set_hatch and Patch.set_hatch and add it there too