refactor: redo binary codec types to simplify

[mvadari]

High Level Overview of Change

This PR:

• Fixes a typing issue with the binary parser that was caused by a circular dependency (which we now know how to resolve)
• Renames SerializedDict -> STObject and SerializedList -> STArray (to match rippled names)
• Refactors the list of types in FieldInstance to pull directly from xrpl.core.binarycodec.types, so that doesn't need to be edited every time a new type is added

There are no feature changes here; this is just an internal refactor.

Context of Change

I was adding some new types to the binary codec and thought that needing to add them in 2 places was unnecessary. I fixed a few other things to make the binary codecs more analogous as well.

Type of Change

• Refactor (non-breaking change that only restructures code)

Test Plan

CI passes. Tests that test the internal objects were edited to use the new type names (the methods exposed externally have not changed at all).

[JST5000]

LGTM

[ckniffen]

@mvadari Would you consider minor version bump?

[mvadari]

@mvadari Would you consider minor version bump?

There's literally no feature change - this PR is just refactors. No one should be using this library at the depth where I changed things.

We'll have to do a minor version bump for #397 anyways, so it can be rolled into that.