Allow URL for lock-file CLI flag

[pinebit]

🎯 Problem to be solved

The idea is suggested by Oisin here: ObolNetwork/obol-gitbook#76 (comment)

🛠️ Proposed solution

• Add support for https URLs for the --lock-file CLI flags, in particulate for all edit commands

🧪 Tests

• Tested by new automated unit/integration/smoke tests

[KaloyanTanev]

We might as well add it to other charon commands (not run though) that require cluster lock or definition? Not as important though.