fix(input): handle correctly case where we pass by string list as inputs

[mudler]

Description

This pull request refactors type handling and improves type safety in the mergeOpenAIRequestAndBackendConfig function within core/http/middleware/request.go. The changes focus on replacing interface{} with the more modern any type and enhancing the processing of nested data structures.

Type handling improvements:

• Replaced interface{} with any for better readability and alignment with Go's modern conventions. ([core/http/middleware/request.goL386-R405](https://github.com/mudler/LocalAI/pull/5521/files#diff-953fd8ea90e198b803c88d4a658f3844ff95756ca4fa73658d8dda4e4827faf0L386-R405))

Nested data structure processing:

• Enhanced the handling of nested slices by adding support for int, float64, and string types within the inner loop. This ensures that all valid input types are processed correctly. ([core/http/middleware/request.goL386-R405](https://github.com/mudler/LocalAI/pull/5521/files#diff-953fd8ea90e198b803c88d4a658f3844ff95756ca4fa73658d8dda4e4827faf0L386-R405))
• Updated logic to append string values to config.InputStrings in addition to handling numeric types for config.InputToken. ([core/http/middleware/request.goL386-R405](https://github.com/mudler/LocalAI/pull/5521/files#diff-953fd8ea90e198b803c88d4a658f3844ff95756ca4fa73658d8dda4e4827faf0L386-R405))

Notes for Reviewers

Signed commits

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