fix: when decoding pem files, handle lines being terminated by CRLF as well as just LF

[gkc]

fix: when decoding pem files, handle lines being terminated by CRLF as well as just LF
test: added unit test accordingly

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.80%. Comparing base (d41840a) to head (11a3839).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #157   +/-   ##
=======================================
  Coverage   52.80%   52.80%           
=======================================
  Files          63       63           
  Lines        5121     5121           
=======================================
  Hits         2704     2704           
  Misses       2417     2417           

Flag	Coverage Δ
unittests	52.80% <100.00%> (ø)

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Files with missing lines	Coverage Δ
lib/src/ssh_pem.dart	84.44% <100.00%> (ø)

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