AbstractHMM interface

[gdalle]

• Replace the state and observation processes with a single AbstractHMM interface
• Specify and test said interface with RequiredInterfaces.jl (not compatible with LTS, commented out for now)
• Modify the concrete type HMM, which now has fields init, trans and dists
• Rename sufficient stats in Baum-Welch
• Add precompilation workload with PrecompileTools.jl
• Lower Julia compat 1.7 -> 1.6

[codecov]

Codecov Report

Patch coverage: 94.73% and project coverage change: +5.20 🎉

Comparison is base (5df07f3) 86.63% compared to head (416239a) 91.84%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   86.63%   91.84%   +5.20%     
==========================================
  Files          19       16       -3     
  Lines         479      429      -50     
==========================================
- Hits          415      394      -21     
+ Misses         64       35      -29     

Impacted Files	Coverage Δ
ext/HiddenMarkovModelsHMMBaseExt.jl	50.00% <0.00%> (ø)
src/utils/fit.jl	76.92% <ø> (ø)
src/utils/lightdiagnormal.jl	100.00% <ø> (ø)
src/utils/check.jl	80.00% <85.71%> (+13.33%)	⬆️
src/abstract_hmm.jl	93.75% <93.75%> (ø)
src/hmm.jl	89.47% <93.75%> (+20.24%)	⬆️
src/HiddenMarkovModels.jl	85.71% <100.00%> (-14.29%)	⬇️
src/inference/forward_backward.jl	95.58% <100.00%> (ø)
src/inference/forward_backward_storage.jl	100.00% <100.00%> (ø)
src/inference/logdensity.jl	94.73% <100.00%> (ø)
... and 4 more

... and 1 file with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.