[IFRT IR] Add IfrtString element type, which represents an IFRT string dtype - #46215
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…ing dtype Introduces `IfrtStringType` (`!ifrt.string`) in the IFRT dialect as a first-class element type for string arrays, alongside `VifrtStringV1` (`!vifrt.string_v1`) in the versioned VIFRT dialect starting at IFRT IR version 0.5.0. Updates type converters, legalization passes, and versioning rules to support string arrays as ranked tensors with full array properties. PiperOrigin-RevId: 953971250
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[IFRT IR] Add
IfrtStringelement type, which represents an IFRT string dtypeIntroduces
IfrtStringType(!ifrt.string) in the IFRT dialect as a first-classelement type for string arrays, alongside
VifrtStringV1(!vifrt.string_v1)in the versioned VIFRT dialect starting at IFRT IR version 0.5.0.
Updates type converters, legalization passes, and versioning rules to support
string arrays as ranked tensors with full array properties.