Fix circular grid sinc interpolation

[FlorianPfaff]

Fixes the circular grid sinc helper to use normalized sinc interpolation and adds a regression test for exact grid-knot reconstruction.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	70.45s
✅ JSON	prettier	7	0	0	0	0.99s
✅ JSON	v8r	7		0	0	5.34s
✅ MARKDOWN	markdownlint	68	0	0	0	1.87s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.86s
✅ PYTHON	black	1037	40	0	0	64.32s
✅ PYTHON	isort	1037	58	0	0	3.81s
✅ REPOSITORY	checkov	yes		no	no	50.12s
✅ REPOSITORY	gitleaks	yes		no	no	9.73s
✅ REPOSITORY	git_diff	yes		no	no	0.31s
✅ REPOSITORY	secretlint	yes		no	no	35.16s
✅ REPOSITORY	syft	yes		no	no	3.66s
✅ REPOSITORY	trivy-sbom	yes		no	no	12.19s
✅ REPOSITORY	trufflehog	yes		no	no	21.11s
✅ YAML	prettier	11	0	0	0	0.84s
✅ YAML	v8r	11		0	0	12.32s
✅ YAML	yamllint	11		0	0	0.49s

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