Unify DPT definitions

[farmio]

Set explicit dpt numbers for all DPT transcoder definitions and eliminate the need for DPTBase.has_distinct_dpt_numbers() (and possibly has_distinct_value_type())

DPTs to refactor to achieve this:

• DPT 3 (all)
• 10 - Date
• 11 - Time
• 19 - DateTime

Further set up a unittest to avoid new DPT definitions to break this behaviour - eg. don't have explicit dpt_sub_number set (dpt_main_number may be inherited) and to not have base classes in the lookup tree.

assert [
    c for c in DPTBase.__recursive_subclasses__() if c.has_distinct_dpt_numbers()
] == [c for c in DPTBase.__recursive_subclasses__()]

[github-actions]

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