Initial draft of POV, also added camel->snake custom filter

[devcyjung]

Edit: Please review the PR #2077 instead of this! Sorry!

Hello, it took me a lot longer than I expected 😂
I added a custom filter camel_to_snake to convert fromPov -> from_pov, pathTo -> path_to
It wasn't super necessary since I only used it to change some names in the test case. I just added it thinking there might be usecase in the future

[github-actions]

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