Adds the signals sync script here

[korlaxxalrok]

This PR makes it so we can build this script into the app container image and ultimately call it from there via some remote mechanism.

Reasons:

• The container has access to a full runtime environment (config, secrets, etc.)
• Hosting it in the container instead of our job system reduces the necessity to extend the Python environment of the job system (it is a shared system and potentially more easily corruptible)
• Simplifies the wrapper command we need to configure in the job system

Changes here:

• Puts sync-signals-with-metadata.py in a place where it will be built into the web application container image
• Adds a couple of dependencies necessary to run the script

There has been some discussion in a different repo on a few changes we might want to make. Gonna put a link to those here: https://github.com/cmu-delphi/delphi-admin/pull/205

[korlaxxalrok]

@dmytrotsko I've tested most of this in staging and it seems to work. The script doesn't seem to output anything, but I was able to observe the associated DB query. I've also tested running it from Cronicle.

Let me know if you think we should go another way, but this seems like it will work, and we are more likely to keep the script updated in this repo vs. delphi-admin.

(Sorry about adding the package sort to this PR! I only added sqlalchemy and mysql-connector-python.)

[korlaxxalrok]

@melange396 Tagging you here because you had some potential changes you wanted made in https://github.com/cmu-delphi/delphi-admin/pull/205.

[melange396]

cool, ill copy my comments from the other PR into here