wire format: omit the inner type tag empty slices and arrays

[jordens]

• [ ] Wire format bump

[jonathanpallant]

This looks OK but it needs a wire-format bump so we need to wait until after 1.0 is released, when we have a bunch of stuff to wrap up into Wire Format Version 5.

[jonathanpallant]

Still want to get this in, but the process will probably need to be:

• Merge to main
• Bump the Wire Format
• Do a defmt-parser / defmt-decoder release that knows about the new format
• Send a PR to probe-rs
• Get the PR merged
• Wait for the new probe-rs release
• Then release a defmt-1.1.0 with the new wire format enabled by default

It's that or we find a way to use version 4 by default and let people opt-in to version 5. We should probably have a road-map so they know when defmt releases are coming and which probe-rs versions they are going to need to have.