[Plasma] Add deletion cache to delete objects later

[asfimport]

Currently, the Delete function will skip the objects that are in use. If you want to delete the objects later, you need to call the Delete function again. We need to guarantee that the objects will be deleted when they are not in use later.

Reporter: Yuhong Guo / @guoyuhong
Assignee: Yuhong Guo / @guoyuhong

PRs and other links:

• GitHub Pull Request #2273
• ARROW-2864: [Plasma] Add deletion cache to delete objects later when they are not in use. #2273

_{Note: This issue was originally created as ARROW-2864. Please see the migration documentation for further details.}

[asfimport]

Philipp Moritz / @pcmoritz:
Issue resolved by pull request 2273
#2273