feat: Add new type generation

[louis-pre]

Context

Lots of context here, I can't cover it all in a PR description. Will be discussed with the team.

High level explanation

This PR adds the generateTypes function, it reads a Zapatos schema file and generates a number of typescript type files from it.

Output:

• A Kysely schema
• A Knex schema (optional)
• One type file per table organized in folders per schema
• One customization file for each configured table (optional)
• Pgtui bugs reproduction for each configured table (optional)

See this PR for an example of the output (with none of the optional stuff though)

Architecture

• generateTypes takes a config as parameter that allows the user to customize the generated output.
• The file-generators folder follows a Nextjs file-based routing style structure. In our case, each "route" is a file generator.
  Following this structure helps document where the generated files will be located and how they'll be named.