Minor refactoring. Introducing a codec type enum.

[fulmicoton]

No description provided.

[PSeitz]

LGTM, but there are some clippy errors

[codecov-commenter]

Codecov Report

Merging #1477 (9a0dd48) into main (513f682) will decrease coverage by 0.00%.
The diff coverage is 79.80%.

@@            Coverage Diff             @@
##             main    #1477      +/-   ##
==========================================
- Coverage   94.08%   94.08%   -0.01%     
==========================================
  Files         239      239              
  Lines       44768    44789      +21     
==========================================
+ Hits        42120    42138      +18     
- Misses       2648     2651       +3     

Impacted Files	Coverage Δ
fastfield_codecs/src/bitpacked.rs	100.00% <ø> (ø)
fastfield_codecs/src/linear.rs	99.57% <ø> (ø)
fastfield_codecs/src/main.rs	1.01% <0.00%> (ø)
src/fastfield/mod.rs	94.76% <ø> (-0.01%)	⬇️
src/fastfield/reader.rs	88.05% <42.85%> (+0.32%)	⬆️
src/fastfield/serializer/mod.rs	89.21% <79.16%> (-1.08%)	⬇️
fastfield_codecs/src/lib.rs	97.14% <95.34%> (+0.54%)	⬆️
fastfield_codecs/src/blockwise_linear.rs	100.00% <100.00%> (ø)
src/fastfield/gcd.rs	100.00% <100.00%> (ø)
src/fastfield/multivalued/mod.rs	94.11% <0.00%> (-2.95%)	⬇️
... and 4 more

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