[ocaml-install]: Add ocaml-install component/view + wire up to engine

[dmmulroy]

Parent #61

We want to create our component and view for this ticket. Good examples to look at would be env_check/.re, init/wizard.re, inti/scaffold.re.

The component should run the following checks (some of which are already implemented in src/core and publicly exposed via src/core/engine

1. Validate that a dune-project file exists in the current directory
2. Update the dune-project section to append the new dependency (this will need implemented as a new "process" in src/core/dune.ml See #: TODO
3. Run eval $(opam env)
4. Run dune b @install
5. Run opam update
6. Run opam install . --deps-only --yes