Output directory support for az cli bicep module

[liliankasem]

Currently you can use --outdir with the bicep cli to output results into a folder, this doesn't seem to be possible using the az cli version.

It would be great if we can do something like this: az bicep build -f main.bicep --outdir arm-templates/

It would also be nice to be able to use a wildcard to build all bicep files in a given directory e.g. az bicep build -f deploy/*.bicep

[TSunny007]

Could you also check and remove multi-file build/decompile options found in #1971