feat: systemd support

[jason-lynch]

Summary

Adds preliminary support for orchestrating pgEdge Enterprise Postgres databases using SystemD instead of Docker Swarm.

Testing

This PR includes a lima-based development environment. See the changes in running-locally.md for complete instructions. If you're already set up to run the lima-based E2E fixtures, you can do:

# install circus
pipx install --include-deps circus

# deploy the dev-lima environment. this is more similar to the compose environment in
# that all ports are exposed on your host machine and we mount the project directory
# into all of the VMs.
make dev-lima-deploy

# that will take a while to set everything up
# once it's done, you can run the environment
make dev-lima-run

# then, in a new terminal, you can use the new dev-lima environment
use-dev-lima
cp1-req get-version
cp1-ssh
# etc..

# you can also run E2Es against this environment
make test-e2e E2E_PARALLEL=4 E2E_FIXTURE=dev-lima

Notes for Reviewers

As of this PR, the control-plane server does not respond to upgrades or other package changes that happen after the server starts. If you install a minor version update, you will be blocked from updating existing databases until you:

• Performed the same upgrade on all hosts that are running the database
• Update the postgres_version in your database spec

This will change in a subsequent PR.

PLAT-417

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