fix: add back version to symsorter CLI

[supervacuus]

The latest release from today (23.6.0) introduced a regression to the symsorter CLI: the option/flag --version no longer works and isn't mentioned anymore in the help output.

This regression was introduced by the dependency switch from structopt to clap (#1209). structopt adds the version flag automagically as the CARGO_PKG_VERSION if not set (nor explicitly disabled via no_version): https://docs.rs/structopt/latest/structopt/#magical-methods

Of course, clap does the opposite and requires version to be enabled via the command attribute: https://docs.rs/clap/latest/clap/_derive/index.html#command-attributes

This should probably be fixed in the other CLIs as well (besides symbolicator itself since it is explicitly overwritten there), let me know.

[codecov]

Codecov Report

Merging #1219 (9c05d45) into master (a06fe63) will decrease coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1219      +/-   ##
==========================================
- Coverage   75.41%   75.40%   -0.01%     
==========================================
  Files          87       87              
  Lines       13856    13856              
==========================================
- Hits        10449    10448       -1     
- Misses       3407     3408       +1