Add fileextensions for modules as default

[jogibear9988]

Maybe you could add the 'mjs' and 'mts' extensions as default?

[firsttris]

for config files? we already have those: https://github.com/firsttris/vscode-jest-runner/blob/master/src/jestRunnerConfig.ts#L99

of you mean for test files? that a bit unsual.

[jogibear9988]

Maybe unusual, but still possible.