docs(command): zebra download

[oxarbitrage]

Motivation

We want to have some sort of the documentation for the zk-SNARK parameters zebra download at startup or using the zebrad download command.

Close #3383

Solution

• Add a new section to the book.
• Document the parameters and their usage in zebra.
• Add an extra logging line to show the process of downloading/verifying parameters is complete.

Review

Anyone can review.

Reviewer Checklist

• Will the PR name make sense to users?
  • Does it need extra CHANGELOG info? (new features, breaking changes, large changes)
• Are the PR labels correct?
• Does the code do what the ticket and PR says?
  • Does it change concurrent code, unsafe code, or consensus rules?
• How do you know it works? Does it have tests?

[codecov]

Codecov Report

Merging #5901 (4a7a32d) into main (256b1c0) will increase coverage by 0.08%.
The diff coverage is 100.00%.

❗ Current head 4a7a32d differs from pull request most recent head f2a2d4b. Consider uploading reports for the commit f2a2d4b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5901      +/-   ##
==========================================
+ Coverage   77.94%   78.03%   +0.08%     
==========================================
  Files         312      312              
  Lines       38987    38996       +9     
==========================================
+ Hits        30387    30429      +42     
+ Misses       8600     8567      -33     

[teor2345]

Looks good, I just want to check about the panic, that seems bad.

[mpguerra]

Looks good, great summary! A few typos to fix and that's it from me

[teor2345]

Thanks, looks good to me!

Requested changes were made