Convert from CJS to ESM

[Copilot]

Converts the module system from CommonJS to ESM, following the pattern from Azure/avocado#220.

tsconfig.json

• target: esnext, module: nodenext, moduleResolution: nodenext
• isolatedModules: true (required by ts-jest for nodenext)

package.json

• Added "type": "module"
• Test scripts use NODE_OPTIONS="--experimental-vm-modules" for Jest ESM support

Import changes

• Added .js extensions to all ~430 relative imports
• CJS packages (lodash, ajv, yargs, etc.) use default imports instead of named/namespace imports — Jest's ESM VM doesn't support CJS named export detection:

  // Before
  import { parseInt } from "lodash";
  import * as _ from "lodash";
  
  // After
  import lodash from "lodash";
  const { parseInt } = lodash;
  import _ from "lodash";

• Type-only re-exports use export type for isolatedModules compliance
• JSON imports use createRequire(import.meta.url) (prettier 2.x doesn't support with { type: "json" })

Config files

• Renamed .js → .cjs: jest.config, .eslintrc, jest.setup-file, regression jest configs
• Added eslint-import-resolver-typescript for .js → .ts resolution

Circular dependency fix

• Extracted TYPES symbols into lib/inversifyTypes.ts to break the cycle: inversifyUtils → ajvSchemaValidator → inversifyUtils
• Files import TYPES from inversifyTypes.ts and inversifyGetInstance/inversifyGetContainer from inversifyUtils.ts

CLI

• Replaced yargs.commandDir() (uses require() internally) with explicit .command() calls
• __dirname replaced with import.meta.url + fileURLToPath

Jest

• useESM: true with extensionsToTreatAsEsm: [".ts"]
• moduleNameMapper strips .js from relative imports for source resolution
• Test files import jest from @jest/globals where jest.setTimeout() is used

Original prompt

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This section details on the original issue you should resolve

<issue_title>Convert from CJS to ESM</issue_title>
<issue_description>Similar to Azure/avocado#220, but use these in tsconfig.json:

target: esnext
module: nodenext</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Convert from CJS to ESM #1218

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