feat(lazer): improve protocol types and modules

[Riateche]

Summary

Some improvements for pyth-lazer-protocol crate. Commit-by-commit reading is recommended.

• Make Price and Rate method names more verbose. Replace trait implementations with methods where the semantics of trait implementations are ambiguous.
• Support proper (non-inverted) exponent values in Price and Rate APIs. Change exponent type to i16. Implement operations with positive exponents (we don't really need them but why not).
• Add some tests for Price and Rate.
• Restructure modules:
  • Move Price and Rate to separate modules and reexport them at crate root.
  • Merge api, router, subscription modules into api. Rename subscription::{Request, Response} to api::{WsRequest, WsResponse}.
  • Move PublisherId, PriceFeedId, ChannelId, PriceFeedProperty to crate root. They are not bound to a particular API.
  • Move FixedRate to time module.
• Some comments and small improvements.

Rationale

Code quality improvement.

How has this been tested?

• Current tests cover my changes
• Added new tests
• Manually tested the code

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