Preserve von Mises subclasses in factories and operations

[FlorianPfaff]

Summary

Fix a subclass-erasure bug in VonMisesDistribution analogous to the recently fixed vMF/Gaussian cases.

from_moment, multiply, and convolve constructed VonMisesDistribution directly, so calling these APIs through a subclass silently returned the base class and discarded subclass behavior/state.

Changes

• make from_moment a classmethod and construct via cls
• make multiply preserve the left-hand runtime type
• make convolve preserve the left-hand runtime type
• add focused regressions for regular and uniform moment/convolution results

Regression covered

Before this patch:

class MyVonMises(VonMisesDistribution):
    pass

x = MyVonMises(0.2, 1.5)
assert isinstance(x.multiply(VonMisesDistribution(1.1, 0.7)), MyVonMises)  # failed
assert isinstance(x.convolve(VonMisesDistribution(1.1, 0.7)), MyVonMises)  # failed
assert isinstance(MyVonMises.from_moment(x.trigonometric_moment(1)), MyVonMises)  # failed

The patch makes these operations consistent with the repository's subclass-preserving distribution APIs.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Max errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no		no	7.89s
✅ JSON	prettier	7	0	0		0	0.84s
✅ JSON	v8r	7		0		0	5.7s
✅ MARKDOWN	markdownlint	68	0	0		0	2.22s
✅ MARKDOWN	markdown-table-formatter	68	0	0		0	0.45s
✅ PYTHON	black	2010	23	0		0	70.45s
✅ PYTHON	isort	2010	39	0		0	3.05s
✅ REPOSITORY	betterleaks	yes		no		no	1.27s
✅ REPOSITORY	checkov	yes		no		no	38.98s
✅ REPOSITORY	git_diff	yes		no		no	0.2s
✅ REPOSITORY	secretlint	yes		no		no	121.17s
✅ REPOSITORY	syft	yes		no		no	3.85s
✅ REPOSITORY	trivy-sbom	yes		no		no	3.19s
✅ YAML	prettier	11	0	0		0	0.7s
✅ YAML	v8r	11		0		0	18.8s
✅ YAML	yamllint	11		0		0	1.13s

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