feat(gpu): add DISPATCH_POLY_SIZE macro to replace manual switch dispatches

[pdroalves]

This PR introduces macros to avoid the long and error prone switch cases we use when Params based on AmortizedDegree or Degree are needed.

closes: please link all relevant issues

PR content/description

Check-list:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• Relevant issues are marked as resolved/closed, related issues are linked in the description
• Check for breaking changes (including serialization changes) and add them to commit message following the conventional commit specification

[github-actions]

✅ Backward-compat snapshot: everything looks good! No backward-compatibility issues detected.

[github-actions]

Forward Compatibility Matrix

TYPE	1.5.5 loads 1.6.3 data	1.5.5 loads 1.7.0 data	1.6.3 loads 1.7.0 data	1.5.5 loads nightly data	1.6.3 loads nightly data	1.7.0 loads nightly data
CompactPublicKey	FAIL: invalid value: integer 1, expected variant index 0 <= i < 1	FAIL: invalid value: integer 1, expected variant index 0 <= i < 1	OK	FAIL: invalid value: integer 1, expected variant index 0 <= i < 1	OK	OK
CompactPkeCrs	OK	OK	OK	OK	OK	OK
ProvenCompactCiphertextList	FAIL: invalid value: integer 1, expected variant index 0 <= i < 1	FAIL: invalid value: integer 1, expected variant index 0 <= i < 1	OK	FAIL: invalid value: integer 1, expected variant index 0 <= i < 1	OK	OK

[github-actions]

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