Add two missing helper functions

[thofma]

• Add lift for fq_default_poly -> ZZPolyRingElem - Generalize set_coeff! for qadic
• Generalize set_coeff! for qadic

[codecov]

Codecov Report

Merging #1574 (137209c) into master (978dd47) will decrease coverage by 0.03%.
Report is 4 commits behind head on master.
The diff coverage is 92.30%.

@@            Coverage Diff             @@
##           master    #1574      +/-   ##
==========================================
- Coverage   84.21%   84.18%   -0.03%     
==========================================
  Files          94       94              
  Lines       36634    36655      +21     
==========================================
+ Hits        30850    30858       +8     
- Misses       5784     5797      +13     

Files	Coverage Δ
src/flint/fq_default_poly.jl	93.68% <100.00%> (+0.18%)	⬆️
src/HeckeMoreStuff.jl	3.23% <50.00%> (+0.38%)	⬆️

... and 11 files with indirect coverage changes

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