fix: add integer and minimum validation for limit parameter

[karamvirsingh1998]

HEY @MaheshtheDev @Dhravya I was trying to integrate the api to lsit the documents , i accidently put negative number and it returned , there i catched one bug , so i tried to test it on rest of the things also

I found this

1. It is not working on decimal numbers [ Returning on server error]
2. It is returning even on negative numbers

I have added fixes for it and tested it . Please review and Merge

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[karamvirsingh1998]

@MaheshtheDev Can you review this

[MaheshtheDev]

thanks for your suggestion but these changes doesn't certainly effect on backend. will make sure we do on the backend though