Speed up signing paths

[bdraco]

Proposed change

Speed up signing paths. This is small QOL improvement when watching cameras.

I noticed we could speed this up a bit when testing the new PyJWT (#93128)

We could get a bit more out of this since api_jws is using built-in JSON but I didn't want to re-implement that function because it seems like risk we didn't want to carry. https://github.com/jpadilla/pyjwt/blob/d7c54dbebdab2ae17f7948fd4432b15e1bb82852/jwt/api_jws.py#L103

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[bdraco]

JWT wants timestamps as int. Doing this here instead and passing to api_jws avoids all the expensive conversions and copies since our times are always in UTC

[frenck]

Thanks, @bdraco 👍

../Frenck