[feature request]: default implementations in the ModbusContext trait

[Eisverygoodletter]

Currently, the get/set_holdings_from_* and get/set_inputs_from_* functions need to be implemented manually for every one of the supported types if you want a custom ModbusContext. I think default implementations can be provided directly in the trait for the functions handling u8, f32, u64 and u32 since they are repeated usages of the get/set functions for u16.

Additionally, the set/get bulk functions could also have default implementations because they only need to repeatedly call the single read/write functions.

Adding the default implementations will make creating a custom ModbusContext implementation easier. Would you be interested in adding this if I implement the default implementations and made a PR? I can do that if you are.

[divi255]

sorry for the delay. yep that's a good idea. send PR please if you can

[Eisverygoodletter]

PR made here #39

There's still a few unresolved issues I've listed there. Sorry for the late reply.