Add Support for In/Out Report SerDes

[Gentoli]

Changes:

• Support Report IDs
• BREAKING: remove custom serialization in favour of serde/derive
• split user provided struct to In and Out:

For example with struct

#[gen_hid_descriptor(..)]
struct SomeReport {
  a: u8,
  b: u8,
  c: u8,
}

If there are only input items or only output items, the struct remain unchanged.
If there are both input and output items in the descriptor, the output is moved to a new struct named SomeReportOut and it shares the same access as the original struct.

• add managed push_input and pull_output. These methods will be available if the respective input/output structs are available.

using the above descriptor as an example, push_input can only accept SomeReport as a parameter if the descriptor have input items.

• ...?

TODO:

• Add doc on struct generation behaviour.
• Add test (examples?) for the procedural macros
• ...?
• ...?