feat: add collapseSamePrefixes option to prevent duplication inside namespaced component name

[DrJume]

When using directoryAsNamespace: true a component path like src/components/collapse/collapseFolderAnd/CollapseFolderAndComponentPrefixes.vue would be converted into a component named CollapseCollapseFolderAndCollapseFolderAndComponentPrefixes.

I implemented an option to collapse same prefixes in folder names and file name, so that it becomes CollapseFolderAndComponentPrefixes.

Closes #307

[hymair]

This does not seem to work.

File path: ~/components/app/sidebar/Sidebar.vue
Generated type: AppSidebarSidebar: typeof import('./../components/app/sidebar/Sidebar.vue')['default']

The collapseSamePrefixes option is also missing from the README.

@DrJume @antfu

[DrJume]

If it still doesn't work, maybe create an issue with reproduction and reference this PR.

I will create a PR for adding it to the README. Somehow I forgot to add it there. 😅