New version: PromptingTools v0.51.0

[JuliaRegistrator]

• Registering package: PromptingTools
• Repository: https://github.com/svilupp/PromptingTools.jl
• Created by: @svilupp
• Version: v0.51.0
• Commit: d04c737c161f5b6e7a20da1668335fcdcf0a96c6
• Reviewed by: @svilupp
• Reference: svilupp/PromptingTools.jl@d04c737#commitcomment-146173801
• Description: Streamline your life using PromptingTools.jl, the Julia package that simplifies interacting with large language models.
• Release notes:

### Added
Added more flexible structured extraction with aiextract -> now you can simply provide the field names and, optionally, their types without specifying the struct itself (in aiextract, provide the fields like return_type = [:field_name => field_type]).
Added a way to attach field-level descriptions to the generated JSON schemas to better structured extraction (see ?update_schema_descriptions! to see the syntax), which was not possible with struct-only extraction.

### Commits

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