feat: bundle inception and salt with sally server start

[kentbull]

This simplifies Sally server management by allowing specification of inception configuration and Habery (keystore) configuration all in the sally server start command. Any existing sally Habery or AID are recognized and used though if they do not exist then a default one is created. Or, if the appropriate arguments are specified, a specific Sally AID is created.

• For setup replaces kli init with --salt (--config-dir and --config-file already existed) and kli incept with --incept-file
• Adds --loglevel / -l argument to specify loglevel. Defaults to INFO

Other small refactorings:

• Adds a healthcheck endpoint at /health that also shows some basic presentation count metrics.
• Moves business logic in the PresentationProofHandler from recur to processNotes and calls processNotes from recur.
• Improves logging findability by adding a human-readable type label to the dicts sent to the webhook.
• moves the CORS middleware and CESR headers to functions in httping for reusability.
• Removes the if listen argument in serving.py since this indirect version of Sally will not need to use the listen argument. The next version of Sally (see my draft PR) removes the indirect version of Sally and changes the setup function.
• Adds a Python Pip cache to the pipeline and cleans up the Makefile.