[Improvement] Add an "auto-phase-identifier" strategy + graph to reduce chances of user error

[nickles-lee]

DEPENDS ON: #100, #102
Improves upon: #101

Problem statement:

• Phase-aware throttling/peak-shaving is a powerful way to improve power-limit safety in a modern power-hungry home (e.g. airco + heat pump + car charger + batteries).
• This is contingent upon all batteries in the system being correctly mapped to their phases.
• A mismapped battery risks overload, e.g. attempting to peak-shave on a heavily loaded phase without solar panels, when the current phase is already at -16A

Proposed Solution:

• Graph that shows all three phases
• An "identify phase" button for each battery that triggers the following strategy:
• A simple "strategy" that triggers: Full-stop on all batteries except for the one being identified. A short charge sequence of +1000W, -1000W, oscillating back-and-forth 3 times (20s full-cycle time) over a minute.