[Bug]: SdkFloatKindsEnum contains decimal types

[antkmsft]

Describe the bug

Decimal types are Fixed Points, not Floating Points, therefore they shouldn't be in SdkFloatKindsEnum - either name the enum "SdkFractionalKindsEnum", or split it into "SdkFloatingPointKindsEnum" and "SdkFixedPointKindsEnum" (or do both - SdkFractionalKindsEnum = SdkFloatingPointKindsEnum | SdkFixedPointKindsEnum).

Reproduction

See https://github.com/Azure/typespec-azure/blob/54567f763257300e64603091659d282072631d2a/packages/typespec-client-generator-core/src/interfaces.ts#L137-L143

Checklist

• [X] Follow our Code of Conduct
• [X] Check that this issue is about the Azure libraries for typespec. For bug in the typespec language or core libraries file it in the TypeSpec repo
• [X] Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• [X] The provided reproduction is a minimal reproducible example of the bug.