Provide access to module params as .params property

Currently I have several modules where I would like to re-access the inputs and I re-output them.

Seeing as the information is already available, it would be useful to be able to access module inputs as a `.inputs` property on the module.

Clarify whether the requested property is `.params` or `.inputs`, then review how Bicep modules expose their inputs and how those values are represented in generated Azure deployment output. Done means the issue's intended property and behavior are specified well enough to implement and verify for modules that re-output their inputs.

Written by the indexing model from the issue text.