Improve ergonomics of v3 writer + add compression options

[Uinelj]

No description provided.

[codecov]

Codecov Report

Merging #23 (461056c) into dev (c133f21) will increase coverage by 4.30%.
Report is 15 commits behind head on dev.
The diff coverage is 84.04%.

@@            Coverage Diff             @@
##              dev      #23      +/-   ##
==========================================
+ Coverage   32.34%   36.64%   +4.30%     
==========================================
  Files           9       11       +2     
  Lines         640      704      +64     
==========================================
+ Hits          207      258      +51     
- Misses        433      446      +13     

Files Changed	Coverage Δ
src/oscar_doc/reader.rs	79.20% <ø> (ø)
src/oscar_doc/types/document.rs	0.00% <0.00%> (ø)
src/oscar_doc/types/metadata.rs	0.00% <0.00%> (ø)
src/oscar_doc/writer.rs	100.00% <ø> (ø)
src/v3/types/document.rs	52.23% <0.00%> (-3.15%)	⬇️
src/v3/writer/docwriter.rs	87.50% <87.50%> (ø)
src/v3/writer/writer.rs	94.36% <94.20%> (+22.93%)	⬆️

... and 1 file with indirect coverage changes