EG4 and multiple inverter parallel fixes

[jaredmauch]

• This addresses issues with reading from two inverters of the same type from two different serial ports at once and the data structure requirements to avoid conflicts
• This also soft-disables register ranges that may be in the csv schema but do not respond
• PLACEHOLDER - pending final validation after syncing branch changes

[BuxtonCalvin]

Hey Jared. Is there any way to revise your code so that one can read from two inverters of different types. I imagine it's moving code out of the class space and into the instance space for a couple of base classes. I'm asking because I've pretty much finished a timescaledb bridge (though there are still some bugs), and though the TS bridge can handle multi-inverters, it can only handle one inverter type (per the current PPG base class code). To allow multiple types of inverters would not be too difficult in the bridge, but I would need to access instances of the registry maps, not class based registries. Needed because table field creation relies on the registry map metric names.