Why these changes are being introduced:

Initially, the CLI command create-embeddings only supported reading input records
from the TIMDEX dataset via TDA.  While this is likely the way we'll get input
records, supporting a JSONLines file as input is helpful for testing.

How this addresses that need:
* Adds a new --input-jsonl argument that reads a JSONLines file and uses
those rows as input for creating embeddings.
* Args --dataset-location and --run-id are required when --input-jsonl
is not set.

Side effects of this change:
* None

Relevant ticket(s):
* https://mitlibraries.atlassian.net/browse/USE-137