Add BaseEstimator mixin to LinearModel (#519)

Author: jessegrabowski

pymc_extras/linearmodel.py

@@ -2,10 +2,12 @@
 import pandas as pd
 import pymc as pm
 
+from sklearn.base import BaseEstimator
+
 from pymc_extras.model_builder import ModelBuilder
 
 
-class LinearModel(ModelBuilder):
+class LinearModel(ModelBuilder, BaseEstimator):
     def __init__(
         self, model_config: dict | None = None, sampler_config: dict | None = None, nsamples=100
     ):