Use import to load page and layout (#42325)
Fixes #42534
* Use eager `import()` to load page/layout to avoid esm module resolution error, eager is to make sure all the sub resources like css are also included
* Fix layer detection, should use `module.layer` directly since `module.resourceResolveData` is not alway presented. It lost when switching from `require()` to `import()` for page/layout component
## Bug
- [x] Related issues linked using `fixes #number`
- [x] Integration tests added
- [ ] Errors have a helpful link attached, see `contributing.md`
