Add support for file objects containing bytes (like BytesIO)

[iamDecode]

Previously, byte-containing files were not supported, but such file objects are less error prone and supported by the eTree XML parser. This avoids the necessity of reading all contents as bytes, converting it to string, then passing it as StringIO, which is unnecessary loss of performance.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a4bed07) 99.13% compared to head (237c1f2) 99.45%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   99.13%   99.45%   +0.32%     
==========================================
  Files          24       24              
  Lines        1266     1278      +12     
==========================================
+ Hits         1255     1271      +16     
+ Misses         11        7       -4     

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