Add types to definition.py in rosidl_parser (#791)

* Add types to defintions

Signed-off-by: Michael Carlstrom <[email protected]>

* Move Literal import

Signed-off-by: Michael Carlstrom <[email protected]>

* Cleaner Literals

Signed-off-by: Michael Carlstrom <[email protected]>

* Add py.typed

Signed-off-by: Michael Carlstrom <[email protected]>

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Signed-off-by: Michael Carlstrom <[email protected]>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Author: InvincibleRMC