Add EBCDIC 1047 encoder & prefixer

[Dakinola892]

EBCDIC has many code pages with slightly different encodings for characters.

Code Page 1047 is a commonly used EBCDIC spec with encodings that differ from the EBCDIC encoder already provided, so an additional encoder to handle encoding to this spec might be useful addition

[codecov-commenter]

Codecov Report

Merging #190 (9280f19) into master (151e28e) will increase coverage by 0.30%.
The diff coverage is 82.97%.

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
+ Coverage   70.91%   71.21%   +0.30%     
==========================================
  Files          38       40       +2     
  Lines        1798     1845      +47     
==========================================
+ Hits         1275     1314      +39     
- Misses        336      340       +4     
- Partials      187      191       +4     

Impacted Files	Coverage Δ
encoding/ebcdic1047.go	73.33% <73.33%> (ø)
prefix/ebcdic1047.go	87.50% <87.50%> (ø)

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[alovak]

Thank you!!!