Create wrapper for `modify_teal_module_output` and export them

[donyunardi]

Feature description

With the introduction of modify_teal_module_output(), we need a wrapper to simplify user ability to interact with report_card function.

We discussed two possible wrappers for now:

• modify report card for a module: modify_teal_module_report_card
• disable a report card for a module: disable_teal_module_report_card

Please tidy up the function's documentation too (roxygen)

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[gogonzo]

Done. One can do a following (as of today). Use after to modify the ui or server

<teal_module> |>
  after(
      server = function(data) {
        report(data) <- c(
          report(data),
          "# added content",
          "This content has been added through `after`"
        )
        data
      }
    )