Upgrading Deps and Moving core and common from dev dependencies to dependencies (fixes monorepo bugs)

[JoeyEamigh]

Nestjs 8 requires rxjs 7 or greater, so I bumped the versions in this package. I am unsure if this is a breaking change for Nestjs 7.

[JoeyEamigh]

This may not actually be necessary - I seem to have a bug in my monorepo that's causing this error. Going to investigate.

[JoeyEamigh]

So it looks like the bug is that this package requires @nestjs/common and @nestjs/core but they were only listed in dev dependencies. This would normally never be an issue, but in a monorepo where packages are staggered between different node_modules folders, this package needs to explicitly declare those packages as dependencies or it will break.