Allow `solve` to automatically submit inputs

[fspoettel]

aoc-cli supports submitting inputs with a command. It would valuable to support automatic submissions for solve behind a flag, e.g. cargo solve 04 --submit.

[fspoettel]

#21 added a wrapper module for aoc_cli, this should be a bit easier now.

[fspoettel]

I implemented this on my 2022 repo here. I'll test it tomorrow and if all goes well, write the docs and merge into this template.

The syntax for submissions will be cargo solve <day> --submit <part>. --submit will be ignored until the part function produces a Some() istd. of a None.

The implemented solution has two nice side effects:

1. It uses .cargo/config.toml's [env] to set the year, thereby eliminating the --year flags.
2. solve is now a command istd. of an alias and accepts 6 in addition to 06 for day input.

[kwiat1990]

Hey, I wonder what’s the current state of this pull request?

[fspoettel]

@kwiat1990 I am a bit preoccupied with work until march/april. Planning to merge this alongside other improvements (better benchmarks, improved scaffolding) as soon as I have some spare time.