[Feature Request]: Rename validate_inputs function or deprecate it

[osenan]

Feature description

Function validate_inputs has a name too similar to validate_input. But the inner behavior and usage is different, which might create confusion among users. I suggest:

1. Rename validate_inputs to validate_shiny_input or a name that is different enough from validate_input so it is clear for the user that they are different functions
2. Deprecate validate_inputs as validate_input covers all its use cases. validate_inputs is only useful for apps that use shinyvalidate package.

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