Move py-markupsafe to src folder am: 2712506a26 am: 400f1b1623 am: 4aa7cd23c6 am: d8a6d0f7e4

Original change: https://android-review.googlesource.com/c/platform/external/python/markupsafe/+/2218824

Change-Id: I7f8e58cfed1facd59dc834664438da1d8a918a91
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>