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Improve hermes profile frame keys to better group frames (#459)

Because all args are serialized in the key for hermes profiles, frames were not properly getting grouped since the "parent" property was different. This PR ensures that the frame key is properly constructed from the function name, file name, line + column number.

| Before | After |
| ----- | ----- |
| <img width="1727" alt="Screenshot 2023-12-27 at 2 25 32 PM" src="https://github.com/jlfwong/speedscope/assets/9957046/4ec04653-5a80-4f34-9506-48e0eb415983"> | <img width="1728" alt="Screenshot 2023-12-27 at 2 26 02 PM" src="https://github.com/jlfwong/speedscope/assets/9957046/c3edc447-e8ad-4757-8576-cbb8c27eafe3"> |
| <img width="1720" alt="Screenshot 2023-12-27 at 2 13 37 PM" src="https://github.com/jlfwong/speedscope/assets/9957046/10194aba-8f26-48ca-bf15-06917b44ea99"> | <img width="1728" alt="Screenshot 2023-12-27 at 2 14 20 PM" src="https://github.com/jlfwong/speedscope/assets/9957046/75c32401-1705-4b23-b71a-5f0a720160dd"> |

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