BP-68: Delete cookie as part of decommission API.

[Karthickramk]

BP

This is the master ticket for tracking BP-68 :

Adding cookie deletion login in Bookkeeper decommission API.

Proposal PR - TBD

[SongOf]

Is there any plan to add this part?

[SongOf]

Hello, the issure proposed by BP-68 can solve the problem of cookie cleanup in our production environment. So I implemented the code according to your BP-68. The code for BP-68 is implemented in this pr(https://github.com/apache/bookkeeper/pull/4592).