Tidy up decoder 2

[Urhengulas]

This PR does actually quite some restructuring of the defmt_decoder. The main ones are:

• make fn parse_* and fn get_locations methods of struct Table
• move struct Frame and struct Decoder into own private module each to make code easier digestable
• various simplifications

open questions

• First question: What do you thing of splitting it up like this?
• Second question: Should fn decode maybe also become a method of Table?

The tests can likely also get split up more into each submodule, but I'd do this in another PR.

[jonas-schievink]

Looks good!

[jonas-schievink]

Second question: Should fn decode maybe also become a method of Table?

Yeah, this definitely makes sense to me

[Urhengulas]

I've added decode to Table and included your suggestion. Are we good to go?

[jonas-schievink]

Yeah, looks good!

bors r+

[bors]

Build succeeded:

• ci