Add Json generator

[jaswdr]

Description

Adding new JSON generator to generate JSON objects both in string and map[string]interface{} formats.

Are you trying to fix an existing issue?

#70

Go Version

$ go version
go version go1.20.7 linux/amd64

Go Tests

$ go test
2023/08/18 13:31:50 Error while requesting https://loremflickr.com/300/200 : request failed
2023/08/18 13:31:50 Error while creating a temp file: temp file creation failed
2023/08/18 13:31:51 Error while requesting https://randomuser.me : request failed
2023/08/18 13:31:51 Error while creating a temp file: temp file creation failed
PASS
ok      github.com/jaswdr/faker 2.690s