Update athom-smart-plug-v2.yaml - Add additional Energy Statistics

[Roving-Ronin]

• Update project version number.
• Update SNTP update interval to use substitution to set, that was overlooked previously.
• Update SNTP to define pool.ntp.org servers to use, can be changed to country/region pool servers in substitutions.
• Make log level changeable using value declared in substitutions.
• Add Energy Yesterday, Weekly, Monthly sensors (provided by https://github.com/dentra/esphome-components/tree/master/components/energy_statistics - if preferred the component could be copied to Athom Repo instead)
• Amend 'Total Daily Energy' sensor to 'Total Energy Today' to keep in line with 'Total Energy Yesterday/Week/Month' ('Total Yesterday Energy' is incorrect grammar and stops the use of that format).
• Amend 'Energy' sensor to be 'internal', as serves no purpose, has no timeframe associated with it and resets at boot & reflashing. Made changeable via hide_energy_sensor subsitution (true/false).

Edit: Noticed the the Smart Plug (i.e. v1) hasn't been updated for ages, so have updated to bring it up to the same base code / sensors available, as the v2 and v3 plugs.

[Roving-Ronin]

@tarontop Aiden,

FYI here is example of what additional sensors provide / appear like.