Tooling to remove a version

[timotheeguerin]

Add a new tool that is able to remove a version from a spec and update the annotations to carry over to the next version

model Foo {
  a: string;

  @added(Versions.v2)
  b: string;
  @added(Versions.v3)
  c: string;
}

and if we remove v2 the spec would update to

model Foo {
  a: string;

  @added(Versions.v3)
  b: string;
  @added(Versions.v3)
  c: string;
}