fix: add missing dependencies

[merceyz]

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior?

jest-vue-preprocessor is trying to use @babel/template, @babel/core, and pug without declaring them as dependencies. This causes it to rely on the user to install them and hoisting to make them available which is not guaranteed

What is the new behavior?

• @babel/template and @babel/core have been moved from devDependencies to dependencies
• pug has been added as an optional peer dependency

Does this PR introduce a breaking change?

[ ] Yes
[x] No