[components] Convert params schema from classvar to classmethod

[OwenKephart]

Summary & Motivation

I want to play around with more generic components, and I think having this be a classmethod is both more consistent with other methods a user might implement (e.g. load), and also more flexible

How I Tested These Changes

Changelog

Insert changelog entry or delete this section.

[OwenKephart]

• [components] Allow specification of rendering scope #26952 : 2 dependent PRs (#26953 , #26955 )
• [components] Update translator handling in DbtProjectComponent #26946
• [components] Remove translator terminology from SlingReplicationCollectionComponent #26927
• [components] Convert params schema from classvar to classmethod #26925 👈 (View in Graphite)
• master

This stack of pull requests is managed by Graphite. Learn more about stacking.

[schrockn]

Agree. While we're here I would like the bike shed the name. "params" I think is confusing.

• Component Schema (i like that this aligns with component.yaml convention)
• DSL Schema

other thoughts?