refactor: Re-organize class hierarchy

[cbowie-mp]

Instructions

1. PR target branch should be against development
2. PR title name should follow this format: https://github.com/mParticle/mparticle-workflows/blob/main/.github/workflows/pr-title-check.yml
3. PR branch prefix should follow this format: https://github.com/mParticle/mparticle-workflows/blob/main/.github/workflows/pr-branch-check-name.yml

Summary

• {provide a thorough description of the changes}

Testing Plan

• Was this tested locally? If not, explain why.
• {explain how this has been tested, and what, if any, additional testing should be done}

Reference Issue (For mParticle employees only. Ignore if you are an outside contributor)

• Closes https://go.mparticle.com/work/REPLACEME

[cbowie-mp]

I changed expressions to be based on the type they resolve to rather than the type of the operand. This makes it possible for us to restrict the types of operands for various operators.

[cbowie-mp]

The transpiler we're using to go from TS to JSON schema looks for @title in a comments so we can get rid of the add titles to schema script.

I added the necessary comments to all the types we're exposing and double checked the python doesn't have types with incorrect names.

[cbowie-mp]

One annoyance here that might be resolvable, the code gen tool to convert JSON schema to python puts this expression out of order. It puts it above NumberExpression so the python is invalid... I think that's just a bug with the tool, but it's easy enough to manually move it.