WIP: Preserve metadata in simplify_fractions

[YingboMa]

@shashi the test still fails. Do you have some clues?

[codecov-commenter]

Codecov Report

Merging #379 (b722816) into master (48cc5ff) will decrease coverage by 0.34%. The diff coverage is 100.00%.

:exclamation: Current head b722816 differs from pull request most recent head 3d3ae9a. Consider uploading reports for the commit 3d3ae9a to get more accurate results

@@            Coverage Diff             @@
##           master     #379      +/-   ##
==========================================
- Coverage   83.70%   83.35%   -0.35%     
==========================================
  Files          12       12              
  Lines        1479     1478       -1     
==========================================
- Hits         1238     1232       -6     
- Misses        241      246       +5     

Impacted Files	Coverage Δ
src/polyform.jl	92.72% <100.00%> (-1.40%)	:arrow_down:
src/ordering.jl	89.53% <0.00%> (-1.17%)	:arrow_down:
src/code.jl	80.55% <0.00%> (-0.56%)	:arrow_down:

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[shashi]

It is likely getting lost in the round trip to DynamicPolynomials. I didn't take care of this when doing polyform. Will have a look.