Add scripted automation of instruments

[ethanjli]

We need a way to script a sequence of MQTT commands to send based on some schedule. The minimum requirement is addressed by #215; however, other users will probably want something more user-friendly.

• Make the automation config support running a sequence of steps (Enable configuration of scheduled automation jobs for instrument controllers #230)
• Add error reporting in the GUI
• Add job run logging in the GUI
• Create a simple GUI interface for building/editing the config (it's fine if this is Javascript-only if we keep the textarea as a PWA fallback)
• Enable scripting with Python and/or TinyGo, in a wasm-based runtime
• Add a block-based programming system (e.g. with Blockly) which emits a Python script