java_sdk_library: Delegate component module to naming scheme

Adds a naming scheme abstraction to which the java_sdk_library/import
will delegate the task of creating the names of their component
modules. The naming scheme can be selected in a module definition but
for now the only supported option is "default".

Test: m nothing
Bug: 155480189
Change-Id: I708657661188ea4a14a4dd8c6bc4b46237bbe5e0