Better error messages for lacking implementations

[codecov[bot]]

Codecov Report

Merging #32 (e9f12e1) into main (f4b3a78) will decrease coverage by 4.22%. The diff coverage is 0.00%.

:exclamation: Current head e9f12e1 differs from pull request most recent head 4af92f7. Consider uploading reports for the commit 4af92f7 to get more accurate results

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
- Coverage   59.55%   55.32%   -4.23%     
==========================================
  Files          13       13              
  Lines         178      197      +19     
==========================================
+ Hits          106      109       +3     
- Misses         72       88      +16     

Impacted Files	Coverage Δ
src/abstract_point_process.jl	28.57% <0.00%> (-4.77%)	:arrow_down:
src/bounded.jl	0.00% <0.00%> (ø)
src/history.jl	72.91% <0.00%> (-1.56%)	:arrow_down:
src/poisson/multivariate/suffstats.jl	34.78% <0.00%> (-0.22%)	:arrow_down:
src/simulation.jl	76.19% <0.00%> (+1.19%)	:arrow_up:

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