[ENH] update Johnson QPDistributions with bugfixes and vectorization …

…(cyclic-boosting ver.1.4.0) (#232)

Fixes #190 and #188

#### What does this implement/fix? Explain your changes.
- Modfied QPD's methods following interface of vectorized QPD
- Bug fix tests for QPD
- replace scipy.misc.derivative to findiff because it will be removed in
scypy 1.12.0

#### Does your contribution introduce a new dependency? If yes, which
one?

yes, I have extras dependency 
findiff: https://findiff.readthedocs.io/en/latest/

docs/source/api_reference/distributions.rst

@@ -69,6 +69,7 @@ Non-parametric and empirical distributions
     Delta
     Empirical
     QPD_Empirical
+    QPD_Johnson
     QPD_U
     QPD_S
     QPD_B

pyproject.toml

@@ -63,7 +63,8 @@ all_extras = [
     "statsmodels>=0.12.1",
     "tabulate",
     "uncertainties",
-    "cyclic-boosting>=1.2.5; python_version < '3.12'"
+    "cyclic-boosting>=1.4.0; python_version < '3.12'",
+    "findiff",
 ]
 
 dev = [

skpro/distributions/__init__.py

@@ -1,4 +1,5 @@
 """Probability distribution objects."""
+
 # copyright: skpro developers, BSD-3-Clause License (see LICENSE file)
 # adapted from sktime
 
@@ -18,6 +19,7 @@
     "QPD_S",
     "QPD_B",
     "QPD_U",
+    "QPD_Johnson",
     "TDistribution",
     "Uniform",
     "Weibull",
@@ -34,7 +36,7 @@
 from skpro.distributions.mixture import Mixture
 from skpro.distributions.normal import Normal
 from skpro.distributions.poisson import Poisson
-from skpro.distributions.qpd import QPD_B, QPD_S, QPD_U
+from skpro.distributions.qpd import QPD_B, QPD_S, QPD_U, QPD_Johnson
 from skpro.distributions.qpd_empirical import QPD_Empirical
 from skpro.distributions.t import TDistribution
 from skpro.distributions.uniform import Uniform