Support `mts` / `cts` / `cjs` config files

Clear and concise description of the problem

Import ESM-only package in vitest.config.ts

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: No "exports" main defined in /Users/kevin/Developer/open-source/unplugin-jsx-string/node_modules/estree-walker/package.json

If I change extname to mts, Vitest can’t find and load this config file.

Suggested solution

https://github.com/vitest-dev/vitest/blob/5dca4ed8fd700690d022e34d8285bf9de76c0938/packages/vitest/src/constants.ts#L11-L18

 export const configFiles = [ 
      'vitest.config.ts', 
+++   'vitest.config.mts', 
+++   'vitest.config.cts', 
      'vitest.config.js', 
      'vitest.config.mjs', 
+++   'vitest.config.cjs', 
      'vite.config.ts', 
+++   'vite.config.mts', 
+++   'vite.config.cts', 
      'vite.config.js', 
      'vite.config.mjs', 
+++   'vite.config.cjs', 
 ]

Alternative

No response

Additional context

I will try to make an PR to implement it.

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn’t already an issue that request the same feature to avoid creating a duplicate.

[sheremet-va]

Can we release a new version now? /cc @antfu @sheremet-va

After #1541

[sheremet-va]

You can open PR to both 😛