refactor: remove heapless dependency

[GabrielDertoni]

This PR aims to remove the heapless dependency. Currently the implementation relies on heapless::Vec but doesn't have to. Removing this dependency reduces the ammount of code generated and the compile time. It also uses a const DEFAULT for default values of *_DATA types which can be used in const fns.

Look at #156 for more context.

[patrickelectric]

@GabrielDertoni please run cargo fmt.

[patrickelectric]

@GabrielDertoni check ci

[qwerty19106]

You can replace serde_arrays dependency on serde-big-array to fix the trait 'Default' is not implemented for '[u8; 200]' problem.

P.S. Maybe the problem is causes by #[serde(default)]. Then it should be replaced on #[serde(default = "path")].

[GabrielDertoni]

Yes, it appears to be this #[serde(default)] attribute. And I can't simply have a function for that too. I need to create another trait which is exactly the same as Default, with the exception that it works for arrays of any size.

[patrickelectric]

It appears fine by be, is there any further comments around this PR ?

[qwerty19106]

It would be nice to add a link to the issue into the RustDefault description.
The best I found is issue.

Default is special, because we already have impl Default for [T; 0] without the T: Default constraint. Rewrite it in const generics requires the const generics specialization, which is far from the stable yet.

[GabrielDertoni]

ping @patrickelectric