Re-create textInput

1. Define where to store the binding JS methods to use.

customTextInputDeps <- function(binding_step) {
  htmlDependency(
    name = "customTextBindings",
    version = "1.0.0",
    src = c(file = system.file(
      "input-system/input-bindings", 
      package = "OSUICode"
    )),
    script = paste0(
      "customTextInputBinding_", 
      binding_step, 
      ".js"
    )
  )
}