Make config names all use underscores

[emmyoop]

Housekeeping

• I am a maintainer of dbt-core

Short description

dbt is not consistent with config names.

dbt_project.yml	not dbt_project.yml	match
pre-hook	pre_hook	❌
post-hook	post_hook	❌
semantic-models	semantic_models	❌
full_refresh	full_refresh	✅
persist_docs	persist_docs	✅

This may not be a complete list. Part of this ticket will be determining the list.

Acceptance criteria

You can consistently use the underscore version of configs no matter what file you're in. The dash version is still allowed but throws a deprecation warning.

Impact to Other Teams

Possibly adapters? Unlikely. Cloud config may be affected as well?

Will backports be required?

Nope!

Context

This is a papercut for users to have to know what format to enter a config name based on what file they are working in.

[graciegoheen]

@jtcohen6 do you have any historical insight as to why there are inconsistencies here?

[gshank]

Right now we use mashumaro aliases to enforce conversion from dashes to underscores when serializing and deserializing. We might need to have special pre and post serialization methods to normalize to underscores.