Enhancement: Code generation improvements

[jasonpaulos]

This PR contains improvements from algorand/generator#42.

[algochoi]

Looks good - is our new approach to always use generated models for algod/indexer responses going forward?

[jasonpaulos]

Generally speaking, yes, I think we should add a prepare method to any new request classes which uses the generated models to decode the response. For example,

js-algorand-sdk/src/client/v2/algod/getApplicationBoxByName.ts

Lines 45 to 48 in c104590

	// eslint-disable-next-line class-methods-use-this
	prepare(body: Record<string, any>): Box {
	return Box.from_obj_for_encoding(body);
	}

[michaeldiamant]

I visually spot-checked several generated examples confirming they match the OpenAPI specification + existing parts of the repo.