Added byteBuffer based APIs to support zerocopy calls for distributed…

[arvindkandhare]

…log.

Please review and merge these two changes together

[sijie]

sorry for late response. it looks good.

[sijie]

@arvindkandhare some minor comments otherwise they look good to me

[sijie]

@arvindkandhare are you porting this change to apache? if not, I can help you on this one.

[arvindkandhare]

@sijie I have some time this week. I can get started on this. I will update this PR as well as create a new one for apache version. Will get back if I have any issues.

[sijie]

thank you @arvindkandhare

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