defmt-print: Log if malformed frame gets skipped

[Urhengulas]

Also add --verbose-flag to also show non-defmt logs.

Fixes #609

Example

❯ bat defmt-frames | cargo run -- -e hello -v
    Finished dev [unoptimized + debuginfo] target(s) in 0.02s
     Running `/home/urhengulas/Documents/github.com/knurling-rs/defmt/target/debug/defmt-print -e hello -v`
0 INFO  Lorem Ipsum is simply dummy text
└─ hello::__cortex_m_rt_main @ /home/urhengulas/Documents/github.com/knurling-rs/defmt-app/src/bin/hello.rs:8
1 INFO  of the printing and typesetting 
└─ hello::__cortex_m_rt_main @ /home/urhengulas/Documents/github.com/knurling-rs/defmt-app/src/bin/hello.rs:9
2 INFO  industry. Lorem Ipsum has been the 
└─ hello::__cortex_m_rt_main @ /home/urhengulas/Documents/github.com/knurling-rs/defmt-app/src/bin/hello.rs:10
(HOST) WARN  malformed frame skipped
└─ defmt_print @ print/src/main.rs:79
4 INFO  since the 1500s, when an unknown printer 
└─ hello::__cortex_m_rt_main @ /home/urhengulas/Documents/github.com/knurling-rs/defmt-app/src/bin/hello.rs:12
5 INFO  took a galley of type and scrambled it to 
└─ hello::__cortex_m_rt_main @ /home/urhengulas/Documents/github.com/knurling-rs/defmt-app/src/bin/hello.rs:13
6 INFO  make a type specimen book.

[justahero]

LGTM

[Urhengulas]

bors r=justahero

[bors]

Build succeeded:

• ci