add context menu item to build selection url

[bthaile]

References: https://github.com/onflow/flow-playground/issues/129

Description

User can build a hash url with highlighting one line

User can build a hash url with a selection, highlighting multiple lines

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For contributor use:

• [x] Targeted PR against correct branch (see CONTRIBUTING.md)
• [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [ ] Code follows the standards mentioned here.
• [ ] Updated relevant documentation
• [x] Re-reviewed Files changed in the Github PR explorer
• [ ] Added appropriate labels

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Name	Status	Preview	Comments	Updated (UTC)
flow-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 16, 2023 7:02pm