* Add support for Bicep when installed as a plugin to Azure CLI
The compiler for Microsoft's DSL Bicep can be installed both
independently and as a plugin to Azure CLI. The latter is probably how
most people install it.
The program output is the same but Azure CLI wraps the arguments and has
a slightly different interface, hence I opted to copy the old linter and
modify it to match the plugin arguments.
* Fix bicep/az_bicep tests, arguments and parsing
* Actually test the ale_linters#bicep#az_bicep#Handle function in the
test that should test that function, not
ale_linters#bicep#bicep#Handle.
* Use the same method as in bicep/bicep for discarding output file, i.e.
by specifying --outfile to a null file.
* Fix parsing of occasionally occurring leading error type (such as
'ERROR: ').
* Correct option defaults for bicep & az_bicep specified in documentation
Carl Smedstad