Move contents of .coveragerc into pyproject.toml

[marvinpfoertner]

In a Nutshell

This PR removes another tool configuration file (.coveragerc) and moves the configuration into pyproject.toml.

Detailed Description

See above.

Related Issues

None

[codecov]

Codecov Report

Merging #691 (95693da) into main (fc32cce) will decrease coverage by 0.32%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #691      +/-   ##
==========================================
- Coverage   90.26%   89.93%   -0.33%     
==========================================
  Files         192      192              
  Lines        7262     7315      +53     
  Branches     1153     1157       +4     
==========================================
+ Hits         6555     6579      +24     
- Misses        462      491      +29     
  Partials      245      245              

Impacted Files	Coverage Δ
...probnum/randprocs/kernels/_arithmetic_fallbacks.py	83.78% <0.00%> (-11.38%)	⬇️
src/probnum/linops/_arithmetic_fallbacks.py	85.57% <0.00%> (-8.87%)	⬇️
src/probnum/_config.py	91.66% <0.00%> (-8.34%)	⬇️
...probnum/randprocs/markov/continuous/_diffusions.py	92.85% <0.00%> (-2.08%)	⬇️
src/probnum/linalg/solvers/_state.py	98.52% <0.00%> (-1.48%)	⬇️
src/probnum/randprocs/kernels/_kernel.py	91.66% <0.00%> (-0.89%)	⬇️
src/probnum/linops/_linear_operator.py	85.94% <0.00%> (-0.22%)	⬇️
src/probnum/randprocs/markov/_transition.py	100.00% <0.00%> (ø)
src/probnum/randprocs/_random_process.py	92.20% <0.00%> (+0.20%)	⬆️
src/probnum/randvars/_random_variable.py	63.79% <0.00%> (+0.25%)	⬆️