Break library into multiple files

[apike]

Currently Bluejay is all one file - we should split it, to the degree it makes sense, by class and/or what is appropriate to get the files to roughly 50-250 lines each.

[sakuraehikaru]

@apike, @nbrooke the source is now broken up into different logical files. Totally open to suggestion and changes.

A few notes on some of the reasonings behind renaming certain things:

Generic class names like “Sendable” and “Receivable” are all prefixed with “Bluejay” to make codebases that use Bluejay clearer. Otherwise if there are other libraries or context that share similar terminologies, the code can be a bit confusing to understand and slower to read.

Other generic class names such as “ServiceIdentifier” or “DataPadding” are not prefixed with “Bluejay” because they are a bit more specific already, and by trading off a bit of consistency in naming we can prevent absurdly long names in a few cases.

[apike]

This is now complete. 🎉