fix(isMagnetURI): update validation regex

[tux-tn]

This PR updates the isMagnetURI validator regex:

• Fix ReDOS in old regex (thanks to @yetingli for discovering the vulnerability and @JamieSlome for reporting it)
• Validate only exact xt topics (btih,sha1,...) based on this list
• Validate only 32 or 40 hashes (Old regex was validating length between 32 and 40 even if only 32 (md5 and sha1) and 40 (btih, ed2k,...) character hashes are valid )
• Make tr and dn parameters optional (Magnet URI definition doesn't specify if other parameters than xt are required
• Allow passing multiple xt urn using the standard xt.1 and xt.2,... (URI is valid even if only xt.1 is passed)
• Allow any other parameter (protocol allow passing non standard parameters)
• Use placeholder hashes in tests
• Add new tests

All the changes are based on the Magnet URI scheme definition here , there is no IETF RFC concerning magnet URI.

Checklist

• PR contains only changes related; no stray files, etc.
• Tests written (where applicable)

[codecov]

Codecov Report

Merging #1730 (90a51c2) into master (8c4b3b3) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1730   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          101       101           
  Lines         2005      2005           
  Branches       452       452           
=========================================
  Hits          2005      2005           

Impacted Files	Coverage Δ
src/lib/isMagnetURI.js	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8c4b3b3...90a51c2. Read the comment docs.

[profnandaa]

LGTM, thanks for the fix.

[profnandaa]

@tux-tn @ezkemboi -- let me do a release this weekend. You can help complete reviews of the remaining PRs.

[ezkemboi]

Thanks, @profnandaa.
We will do that.

[tux-tn]

Thank you @profnandaa