Updating LRE script to allow for overlaps to be specified per task

[max-radin]

Fixes #34.

[jp7745]

three issues:

0. Setting up a clean VENV for this, I started by only installing pyLIQTR==1.2.1, running python 3.10. Then also going to the top level working directory and pip install -e .. This brings in the qre.py script. The qre.py script tries to from openfermion.resource_estimates.molecule import cas_to_pyscf. First, cas_to_pyscf is not referenced or used. When the LRE script is called, this throws and error and be removed from qre.py... unless it's necessary.

1. in the LRE script, the from datetime import UTC fails. This import can be removed and just replace UTC later in the usage with datetime.timezone.utc or alternative fix.

2. In the solution.uuid.json files produced, the run_time object is missing the overall_time property per the schema. This field may be mislabled as seconds.

[max-radin]

Thanks for catching those issues @jp7745. I made a separate PR to address them (#41) since they aren't related to the changes in this PR.