feat(isMagnetURI): support Bittorrent v2

[Rhilip]

BitTorrent introduced the btmh: protocol in 2020 as part of its BitTorrent v2 changes. https://blog.libtorrent.org/2020/09/bittorrent-v2/
This schema like: magnet:?xt=urn:btmh:1220{64 hashs}
And This pull request will let isMagnetURI function support vaild this schema.

I Also remove the restrict of xt=urn: after magnet:?, since Magnet_URI_scheme Format notice:

Magnet URIs consist of a series of one or more parameters, the order of which is not significant, formatted in the same way as query strings that ordinarily terminate HTTP URLs.

Checklist

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

[codecov]

Codecov Report

Merging #1992 (6c94aae) into master (cfcf911) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1992   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          103       103           
  Lines         2097      2099    +2     
  Branches       473       474    +1     
=========================================
+ Hits          2097      2099    +2     

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

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[tux-tn]

Thank you for your PR @Rhilip and congrats for your first contribution 🎉

I Also remove the restrict of xt=urn: after magnet:?, since Magnet_URI_scheme Format notice:

Nice catch! LGTM

[Rhilip]

Please review again, thanks!
I make a fix since first commit will return true when validate wrong magnetURI which has any prefix exists in xt= component.

Before:

const magnetURIComponent = /xt(?:\.1)?=urn:((?:aich|bitprint|btih|ed2k|ed2khash|kzhash|md5|sha1|tree:tiger):[a-z0-9]{32}(?:[a-z0-9]{8})?|btmh:1220[a-z0-9]{64})($|&)/i;
const testWrongMagnetURI = 'magnet:?ttxt=urn:btmh:1220caf1e1c30e81cb361b9ee167c4aa64228a7fa4fa9f6105232b28ad099f3a302e';
magnetURIComponent.test(testWrongMagnetURI);  // return true, which is completed wrong

After:

[tux-tn]

Thank you for your changes @Rhilip. I added a little suggestion concerning your regex, feel free to check it!

[tux-tn]

LGTM ! Thank you @Rhilip

[profnandaa]

LGTM. Thanks for your contrib! 🎉