Add a check that dependencies don't include conflicting explicit versions

When manually specifying #impl dependencies it can get difficult to
debug issues when both libfoo and libfoo#impl are in the dependencies.
Add a check that the list of shared libraries doesn't include two
of the same library with different explicit versions.

Bug: 372543712
Test: TestCheckConflictingExplicitVersions
Flag: EXEMPT host only
Change-Id: I6863999259ba10381c3bdb8d5ac817736ca4601a