feat(data): add function to push a commit to the platform

[gustavocidornelas]

Summary

• Adds the push function to /src/lib/data/commit.py that enables pushing a commit from the Python SDK.
• It is supposed to be used as follows:

from openlayer import Openlayer
from openlayer.lib.data import commit

client = Openlayer()
commit.push(
    client=client,
    directory="./my-project",  # Path to the project dir, with the `openlayer.json` and datasets
    project_id=YOUR_PROJECT_ID_HERE,
    message="Initial commit" # Defaults to 'New commit' 
)