BICEP MSBUILD Task Should Allow Enforcing File Format

**Is your feature request related to a problem? Please describe.**
The MSBuild task for BICEP processing should include an option to validate the format of the input file.

**Describe the solution you'd like**
To maintain a consistent set of BICP files it would be useful to have functionality in the MSBuild task to enforce standard formatting (i.e. the format that would be used if the bicep format command was used) on the source file. Bonus points if the task included an optional flag to allow automatic reformatting of the source file.

Locate the Bicep MSBuild task and inspect how it processes input files. Compare its behavior with the bicep format command, then define validation and optional rewriting behavior; done means the task can enforce standard formatting and, when enabled, reformat source files.

Written by the indexing model from the issue text.