Include libraries licenses in d8.jar and r8.jar

This change is:
- Excluding META-INF from libraries when packaging the jars.
- Adding a file LIBRARY-LICENSE listing license information of all
  libraries included in the jars.
- Adding a task checkLicenses checking that LIBRARY-LICENSE is aligned
  with the jar dependencies.
- Replace the LICENSE file included in jar by a consolidated version
  containing r8/LICENSE, r8/LIBRARY-LICENSE and every file found in
  library-licensing

From there, any addition or removal of dependency will need an update of
LIBRARY-LICENSE or r8.jar/d8.jar won't package. When updating
LIBRARY-LICENSE we'll need to check that the content of
library-licensing is still accurate, there is no check on this.

Bug: 65479022
Change-Id: I1746c574744bc3d8afc0d16d5687994bc14fd5ea

library-licensing/jopt-simple.txt

diff --git a/library-licensing/jopt-simple.txt b/library-licensing/jopt-simple.txt
new file mode 100644
index 0000000..2077257
--- /dev/null
+++ b/library-licensing/jopt-simple.txt
@@ -0,0 +1,22 @@
+ The MIT License
+
+ Copyright (c) 2004-2016 Paul R. Holser, Jr.
+
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ "Software"), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject to
+ the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.