Fix MarkedPointProcess fitting

[gdalle]

Breaking changes:

• switch the order of type parameters in the MarkedPointProcess constructor
• rework the fitting process to avoid relying on sufficient statistics

Bump version to 0.5.0 and update citation

[codecov]

Codecov Report

Patch coverage: 71.42% and project coverage change: +2.19% 🎉

Comparison is base (b06fc93) 76.53% compared to head (4b98c4d) 78.72%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
+ Coverage   76.53%   78.72%   +2.19%     
==========================================
  Files          14       13       -1     
  Lines         196      188       -8     
==========================================
- Hits          150      148       -2     
+ Misses         46       40       -6     

Files Changed	Coverage Δ
src/PointProcesses.jl	100.00% <ø> (ø)
src/bounded_point_process.jl	38.46% <ø> (ø)
src/poisson/multivariate/suffstats.jl	88.23% <50.00%> (+21.56%)	⬆️
src/poisson/marked/marked_poisson_process.jl	58.33% <66.66%> (+3.78%)	⬆️
src/poisson/marked/fit.jl	84.61% <81.81%> (-15.39%)	⬇️

... and 1 file with indirect coverage changes

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