Fix missing missing (min|max)_sdk_version in bootclasspath.pb

bootclasspath.pb.textproto of an apex contains
min_sdk_version/max_sdk_version information of its exported libraries.
It is populated using the stateful minSdkVersion/maxSdkVersion
properties of the SdkLibrary module. These were previously indirectly
populated by invoking `module.Library.GenerateAndroidBuildActions(ctx)`,
which has been removed https://r.android.com/3079425.

This CL updates the implementation to use `MinSdkVersion(ctx)` and
`MaxSdkVersion(ctx)` to get the appropriate values directly and not rely
on GenerateAndroidBuildActions.

Bug: 345621958
Test: cat out/soong/.intermediates/packages/providers/MediaProvider/apex/com.android.mediaprovider-bootclasspath-fragment/android_common_apex30/c49cac19acc21350e0f3590de64d2f7f/bootclasspath.pb.textproto
jars {
path: "/apex/com.android.mediaprovider/javalib/framework-mediaprovider.jar"
classpath: BOOTCLASSPATH
min_sdk_version: "30"
max_sdk_version: ""
}
jars {
path: "/apex/com.android.mediaprovider/javalib/framework-pdf.jar"
classpath: BOOTCLASSPATH
min_sdk_version: "30"
max_sdk_version: ""
}
jars {
path: "/apex/com.android.mediaprovider/javalib/framework-pdf-v.jar"
classpath: BOOTCLASSPATH
min_sdk_version: "34"
max_sdk_version: ""
}
// min_sdk_version values were empty previously

Change-Id: Ia547747b16d255c1a093deee96a1abb61fd47dff