Add deprecations for more firrtl.Compiler methods (#1791)

Adds missing deprecation warnings to firrtl.Compiler methods: compile
and compileAndEmit. This provides a more informative message to the
user about how to actually migrate. Without this, the user only has
the generic deprecation warning about class Compiler.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>