Support TypeScript based config

[G-Rath]

I like authoring my config files with TypeScript where possible for consistency, continence, and validation, and it's usually pretty straightforward to support - I've implemented this for a few packages now, both with and without cosmiconfig - I think most of the code from this PR should be what's required.

The result would be this:

import { GenerateOptions } from 'eslint-doc-generator/dist/lib/options';

const config: GenerateOptions = {
  ignoreConfig: ['all'],
  ruleDocTitleFormat: 'desc-parens-name',
  ruleDocSectionInclude: ['Rule details'],
  ruleListColumns: [
    'name',
    'description',
    'configsError',
    'configsWarn',
    'configsOff',
    'fixable',
    'hasSuggestions',
    'deprecated',
  ].join(),
  splitBy: 'meta.docs.requiresTypeChecking',
  urlConfigs: `https://github.com/jest-community/eslint-plugin-jest/blob/main/README.md#shareable-configurations`,
};

export default config;

(I would do a PR myself but am a bit burnt out right now so are making an issue instead incase someone else has the bandwidth to pick this up 🙂)

[bmish]

Cool, I would definitely like to support TypeScript configs.