Exporting array of functions as lifecycles should be supported

[filoxo]

I'm updating an example repo of mine to Webpack 5, and that example exports an array of functions, not just one function. Playground validates that the lifecycles are functions. An array of functions is valid as well.

single-spa-playground/src/verify-app-guide/verification-steps/lifecycles-exported.component.js

Lines 16 to 18 in 2b809e7

	typeof mod.bootstrap !== "function" ||
	typeof mod.mount !== "function" ||
	typeof mod.unmount !== "function"

This would be a good candidate for a new contributor or beginner, so contributions for this fix are welcome!