Refactor: rename AutoregressiveComponent to Autoregressive

Author: Jiya873

pymc_extras/statespace/models/structural/components/autoregressive.py

@@ -212,4 +212,4 @@ def make_symbolic_graph(self) -> None:
         cov_idx = ("state_cov", *np.diag_indices(k_posdef))
         self.ssm[cov_idx] = sigma_ar**2
 
-AutoregressiveComponent = Autoregressive
+AutoregressiveComponent = Autoregressive