handroll Bencoder

[mistermoe]

Had this branch sitting around locally for awhile and just remembered. Original intent was to handroll a Bencoder so we could drop the bittorrent dep we were pulling in because:

• it wasn't hosted on maven central (requiring downstream consumers to add yet another repository)
• it introduced a ton of CVEs

looks like @andresuribe87 beat me to it in his most recent PR to update did:dht to reflect the spec text changes we recently made

figured i'd toss this PR up anyway incase we want a more complete Bencoder (though not needed. @andresuribe87 implemented exactly what we needed in order to drop the dep)

[codecov]

Codecov Report

Merging #187 (717ece5) into main (22aa339) will increase coverage by 0.32%.
The diff coverage is 96.36%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #187      +/-   ##
==========================================
+ Coverage   79.82%   80.15%   +0.32%     
==========================================
  Files          34       35       +1     
  Lines        2042     2086      +44     
  Branches      293      305      +12     
==========================================
+ Hits         1630     1672      +42     
- Misses        279      280       +1     
- Partials      133      134       +1     

Components	Coverage Δ
credentials	81.74% <ø> (ø)
crypto	38.07% <ø> (ø)
dids	90.31% <96.36%> (+0.20%)	⬆️
common	80.55% <ø> (ø)