Fix types and key maps for composed schemas

[robhanlon22]

Two issues addressed here:

• The DSL types hash did not merge in parent types. Override the types accessors with one that merges in parent types.
• Operation processing within Macros::Schema did not recursively merge any nested operations.

These fixes allow for different key sets to be processed correctly.

[robhanlon22]

@solnic looks like there is an issue when running the tests against dry-types's current main branch.

[solnic]

@robhanlon22 please rebase, main is now fixed

[robhanlon22]

@solnic this is ready for eyeballs finally! sorry, had a bunch of other stuff i needed to get to

[robhanlon22]

Comments addressed!