CHORE: Move all vue imports to use the extension + update vue cli to require the .vue extension in the import

[rathboma]

For migrating to Vite / esbuild we need to move away from importing vue files without the .vue extension, because it is not supported.

Tasks:

1. Change vue cli to fail if .vue extension is not provided
2. Update all imports to use the .vue extension.

For example:

GOOD: import Component from './Component.vue'
BAD: import Component from './Component'

[rathboma]

@ellipsis-dev Can you do this?