feat(type-checking): disable type check by default

[nicojs]

Change the default of disableTypeChecks to true.

Closes #4204

[SchroederSteffen]

Small hint: The docs need to be updated.

stryker-js/docs/configuration.md

Lines 200 to 206 in 90ebf47

	### `disableTypeChecks` [`boolean` | `string`]
	Default: `"{test,src,lib}/**/*.{js,ts,jsx,tsx,html,vue}"`<br />
	Command: _none_<br />
	Config file: `"disableTypeChecks": false`
	Set to 'true' to disable type checking, or 'false' to enable it. For more control, configure a pattern that matches the files of which type checking has to be disabled. This is needed because Stryker will create (typescript) type errors when inserting the mutants in your code. Stryker disables type checking by inserting `// @ts-nocheck` atop those files and removing other `// @ts-xxx` directives (so they won't interfere with `@ts-nocheck`). The default setting allows these directives to be stripped from all JavaScript and friend files in `lib`, `src` and `test` directories.