Use backend types to generate axios calls on client

[essential-randomness]

This is for Thursday's meeting.

Current limitations:

1. We're copy-pasting the generated OpenAPI spec from the backend to a file. Filed an issue in the library we're using so we don't need this.
2. The import from boba-backend isn't really working as of now anyway cause I haven't checked in that PR.
3. I'm checking in the generated files, which might not be what we want. Maybe a post-install hook for the future
4. I've had to use a Camelize TS helper whose need we might be able to get rid of.

Example of usage in src/utils/queries/feeds.ts

[ghost]

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