[Lorenz] diff_graphs.py prints added and removed package cycles

Example output (shortened):

$ tools/android/dependency_analysis/diff_graphs.py -b 2021-02-22_23-15_monochrome_public_bundle.json -a 2021-02-23_22-38_monochrome_public_bundle.json --package-cycles 4
Total Java class count: +5 (8483 -> 8488)
Total Java package count: +0 (693 -> 693)

Java classes added (+) and removed (-):
+ [   1] org.chromium.android_webview.nonembedded.DownloadFileTask
...
+ [   9] org.chromium.viz.mojom.ResourceId
- [   1] org.chromium.blink.mojom.ClipboardFile
...
- [   4] org.chromium.chrome.browser.password_check.helper.PasswordCheckReauthenticationHelper

Java packages - no changes

Total Java package cycle count (up to size 4): -308 (16471 -> 16163)

Java package cycles added (+) and removed (-):
- [   1] .c.b.app > .c.b.app.appmenu > .c.b.compositor.layouts > .c.b.native_page > .c.b.app
- [   2] .c.b.app > .c.b.app.appmenu > .c.b.tasks.tab_management > .c.b.native_page > .c.b.app
- [   3] .c.b.app > .c.b.app.flags > .c.b.tasks.tab_management > .c.b.native_page > .c.b.app
- [   4] .c.b.app > .c.b.app.tabmodel > .c.b.compositor.layouts > .c.b.native_page > .c.b.app
...
- [ 308] .chrome.browser > .chrome.features.start_surface > .c.b.toolbar > .c.b.omnibox > .chrome.browser


Bug: 1166855
Change-Id: I2e20417370e8ab786f46510595da4c56dc164ef7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2720820
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#865382}