Add journald option for logger

[potuz]

Second try to add a "journald" parameter for --log-journal, without breaking compilation in Windows.

Fixes #7353

It's been reported to build on Windows and all test passing on the CI

[prestonvanloon]

Thanks @potuz !

[codecov]

Codecov Report

Merging #7463 into master will decrease coverage by 0.36%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7463      +/-   ##
==========================================
- Coverage   60.98%   60.62%   -0.37%     
==========================================
  Files         428      427       -1     
  Lines       30714    30567     -147     
==========================================
- Hits        18732    18532     -200     
- Misses       8934     9016      +82     
+ Partials     3048     3019      -29     

[gitcoinbot]

⚡️ A tip worth 25.00000 DAI (25.0 USD @ $1.0/DAI) has been granted to @potuz for this issue from @prestonvanloon. ⚡️

The sender had the following public comments:

Thanks for adding journald logging support and resolving breaking issues for windows quickly.

https://github.com/prysmaticlabs/prysm/pulls?q=is%3Apr+author%3Apotuz+

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