Migrate ServerData Protobuf to v2, switch internal struct to chrono + f32, update time sourcing logic

[jr1221]

Changes

See title. Was just going to just migrate serverdata and update time sourcing logic, but ran into a ton of bugs with ClientData using millisecond timestamps that would require refactoring every instantiation of the struct. So I said fug it and switched the struct to store a DateTime so any caller can pass in precise time. This DateTime is also how the prisma layer understands time. All times utc!!

Also switched the internal data representation to f32 from string because it was really annoying me all of the mapping and parsing back and forth we do. This can be reverted no biggie.

Test Cases

• Works live and query when parsing Calypso accompanying PR: Switch to new protobuf, send timestamp. Calypso#56
• Works live and query when falling back to system time
• Need to test falling back to MQTT time

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