KAFKA-4893: Fix conflict between async topic deletion and max topic length

[vahidhashemian]

With async topic deletion the topic partition folder name is affixed with a '.', a UUID, and '-delete'. If topic name length is close to its current limit (249) this could cause an issue because the folder name size goes over 255. This PR implements the suggestion solution by @onurkaraman in the JIRA. This implementation is automatically backward compatible, and cleans up any folder marked for deletion using the old method (affixing the folder name).

[wushujames]

Does this PR handle the case where a kafka cluster already has a topic called delete? And, does it prevent a topic from being created that is called delete?

[vahidhashemian]

@wushujames With this PR we can still have a topic named delete. The -# affix of topic partition folders would not cause a conflict with the newly introduced delete folder. Does it make sense?

[wushujames]

Ah, right. All the other directories are topic-partitionnum. Thanks.

[vahidhashemian]

@onurkaraman Since there was no additional feedback on the JIRA, I submitted the PR hoping the conversation continues here. Thanks in advance for reviewing.

[vahidhashemian]

@onurkaraman I'd appreciate your feedback when you have a chance to review this PR. Thanks.

[vahidhashemian]

@onurkaraman pinging you again to check if you could take a look. If not, perhaps @hachikuji can help. Thanks!

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