Map spec types to native TS

Use printer.nodes to replace the handler for a schema type with one that builds its own TypeScript AST node. This config maps the date type to a Date type reference and integer to the bigint keyword.

kubb.config.ts

import { defineConfig } from 'kubb/config'
import ts from 'typescript'
import { pluginTs } from '@kubb/plugin-ts'

export default defineConfig({
  input: './petStore.yaml',
  output: { path: './src/gen', clean: true },
  plugins: [
    pluginTs({
      printer: {
        nodes: {
          date() {
            return ts.factory.createTypeReferenceNode('Date', [])
          },
          integer() {
            return ts.factory.createKeywordTypeNode(ts.SyntaxKind.BigIntKeyword)
          },
        },
      },
    }),
  ],
})