refactor: cleanup public symbols and rename transform package

[aajtodd]

Issue \

n/a

Description of changes

Miscellaneous cleanup

• refactor: Render serialization/deserialization types into serde rather than transform package. This better matches our own terminology and was leftover from "do what Java does".
• refactor: Relocate TlsVersion into the net subpackage rather than config
• refactor: Make StringContent and ByteArrayContent internal and force consumers to go through the companion objects for the given types. e.g. ByteStream.fromBytes(...) rather than ByteArrayContent(...). Same for HttpBody.fromBytes(...).

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