Use mean and median accessors

[aloctavodia]

Depends on arviz-devs/arviz-base#120 and arviz-devs/arviz-stats#255

Closes #338

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Codecov Report

❌ Patch coverage is 52.94118% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.63%. Comparing base (8371e8b) to head (72c1a93).

Files with missing lines	Patch %	Lines
src/arviz_plots/plots/dist_plot.py	50.00%	3 Missing ⚠️
src/arviz_plots/plots/lm_plot.py	0.00%	3 Missing ⚠️
src/arviz_plots/plots/forest_plot.py	66.66%	1 Missing ⚠️
src/arviz_plots/plots/ppc_interval_plot.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #374      +/-   ##
==========================================
- Coverage   85.66%   85.63%   -0.03%     
==========================================
  Files          54       54              
  Lines        6147     6149       +2     
==========================================
  Hits         5266     5266              
- Misses        881      883       +2     

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Documentation build overview

📚 arviz-plots | 🛠️ Build #30437030 | 📁 Comparing 72c1a93 against latest (8371e8b)

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Show files changed (53 files in total): 📝 53 modified | ➕ 0 added | ➖ 0 deleted

File	Status
gallery/add_reference_bands.html	📝 modified
gallery/add_reference_lines.html	📝 modified
gallery/combine_plots.html	📝 modified
gallery/plot_autocorr.html	📝 modified
gallery/plot_bf.html	📝 modified
gallery/plot_compare.html	📝 modified
gallery/plot_convergence_dist.html	📝 modified
gallery/plot_dist_ecdf.html	📝 modified
gallery/plot_dist_hist.html	📝 modified
gallery/plot_dist_kde.html	📝 modified
gallery/plot_dist_models.html	📝 modified
gallery/plot_ecdf_coverage.html	📝 modified
gallery/plot_ecdf_pit.html	📝 modified
gallery/plot_energy.html	📝 modified
gallery/plot_ess_evolution.html	📝 modified
gallery/plot_ess_local.html	📝 modified
gallery/plot_ess_models.html	📝 modified
gallery/plot_ess_quantile.html	📝 modified
gallery/plot_forest.html	📝 modified
gallery/plot_forest_ess.html	📝 modified
gallery/plot_forest_models.html	📝 modified
gallery/plot_forest_pp_obs.html	📝 modified
gallery/plot_forest_shade.html	📝 modified
gallery/plot_loo_pit.html	📝 modified
gallery/plot_mcse.html	📝 modified
gallery/plot_pair.html	📝 modified
gallery/plot_pair_distribution.html	📝 modified
gallery/plot_pair_focus.html	📝 modified
gallery/plot_pair_focus_distribution.html	📝 modified
gallery/plot_parallel.html	📝 modified
gallery/plot_pava_calibration.html	📝 modified
gallery/plot_ppc_censored.html	📝 modified
gallery/plot_ppc_coverage.html	📝 modified
gallery/plot_ppc_dist.html	📝 modified
gallery/plot_ppc_interval.html	📝 modified
gallery/plot_ppc_pit.html	📝 modified
gallery/plot_ppc_rootogram.html	📝 modified
gallery/plot_ppc_tstat.html	📝 modified
gallery/plot_prior_posterior.html	📝 modified
gallery/plot_psense.html	📝 modified
gallery/plot_psense_quantities.html	📝 modified
gallery/plot_rank.html	📝 modified
gallery/plot_rank_dist.html	📝 modified
gallery/plot_ridge.html	📝 modified
gallery/plot_ridge_multiple.html	📝 modified
gallery/plot_trace.html	📝 modified
gallery/plot_trace_dist.html	📝 modified
api/generated/arviz_plots.PlotCollection.generate_aes_dt.html	📝 modified
_modules/arviz_plots/plots/dist_plot.html	📝 modified
_modules/arviz_plots/plots/forest_plot.html	📝 modified
_modules/arviz_plots/plots/lm_plot.html	📝 modified
_modules/arviz_plots/plots/ppc_interval_plot.html	📝 modified
_modules/arviz_plots/plots/psense_quantities_plot.html	📝 modified