[idea] Rename `module` into `teal_module` (and also `modules` into `teal_modules`)

[pawelru]

A proposal: rename module() into teal_module() (and similarily modules() into teal_modules()).

Reasons:

• in line with argument data that accepts what teal_data() returns
• avoid confusion internally between modules argument value and modules() function

As a result we would be having something like this:

init(
  data = teal_data() |> ...
  modules = teal_modules(
    teal_module(...)
    ...
  )
)

I think it would more more consistent. Please tell me what you think about this.

This is a breaking change so it needs to be executed with appropriate deprecation strategy and so on.