[Feature Request]: Add arguments to report_previewer to be able to change default author

[gogonzo]

Feature description

report_previewer_ui/srv in teal is added automatically if any module has a reporter argument but it is entirely controlled by teal internals. report_previewer_module is exported from teal and it should be possible for app developer to use custom previewer module instead of default one.

library(teal.modules.general)
pkgload::load_all("teal")
library(scda)

ADSL <- synthetic_cdisc_data("latest")$adsl
ADTTE <- synthetic_cdisc_data("latest")$adtte

module_variable_browser <- tm_variable_browser(
  label = "Variable browser",
  ggplot2_args = teal.widgets::ggplot2_args(
    labs = list(subtitle = "Plot generated by Variable Browser Module")
  )
)

app <- init(
  data = cdisc_data(
    cdisc_dataset("ADSL", ADSL, code = "ADSL <- synthetic_cdisc_data(\"latest\")$adsl"),
    cdisc_dataset("ADTTE", ADTTE, code = "ADTTE <- synthetic_cdisc_data(\"latest\")$adtte"),
    check = TRUE
  ),
  modules(
    module_variable_browser,
    reporter_previewer_module(label = "reports")
  )
)
#> [INFO] 2022-10-14 01:39:09.2209 pid:2564 token:[] teal.modules.general Initializing tm_variable_browser
if (interactive()) {
  shinyApp(app$ui, app$server)
}

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