Exports visibility and package mutator registration functions so they
can be used in sdk testing. Updates sdk test to support visibility and
package modules.
Adds EffectiveVisibility(...)[]string function to make the effective
visibility rules available to sdk snapshot creation.
Extracts compositeRule.Strings() []string from compositeRule.String()
method so that it can be used by above func.
Adds visibility property to sdk snapshot and prebuilt modules along
with a test to ensure it works properly.
Adds dir parameter to CheckSnapshot so that it can check the snapshot
generated for a non-root package. That is required in order to ensure
that visibility of :__subpackages__ on a source module in package
<pkg> is resolved to an effective visibility of
//<pkg>:__subpackages__ on its corresponding prebuilt.
Test: m conscrypt-module-sdk
Bug: 143678475
Change-Id: Icaacac5b9c04726d28e6fec93e49715ac45df7f4
Makes it easier for multiple people to work on different areas without
conflicts.
Bug: 143678475
Test: m conscrypt-module-sdk
Change-Id: I93140450c0b049946a9d0432225bccff82f5a873
